diff --git a/tests/shell/run-tests.sh b/tests/shell/run-tests.sh
index 632ccce..29a2c39 100755
--- a/tests/shell/run-tests.sh
+++ b/tests/shell/run-tests.sh
@@ -43,6 +43,11 @@ if [ ! -x "$MODPROBE" ] ; then
 	msg_error "no modprobe binary found"
 fi
 
+DIFF="$(which diff)"
+if [ ! -x "$DIFF" ] ; then
+	DIFF=true
+fi
+
 if [ "$1" == "-v" ] ; then
 	VERBOSE=y
 	shift
@@ -96,7 +101,7 @@ do
 	kernel_cleanup
 
 	msg_info "[EXECUTING]	$testfile"
-	test_output=$(NFT=$NFT ${testfile} 2>&1)
+	test_output=$(NFT=$NFT DIFF=$DIFF ${testfile} 2>&1)
 	rc_got=$?
 	echo -en "\033[1A\033[K" # clean the [EXECUTING] foobar line
 
diff --git a/tests/shell/testcases/flowtable/0010delete_handle_0 b/tests/shell/testcases/flowtable/0010delete_handle_0
index 985d4a3..8dd8d9f 100755
--- a/tests/shell/testcases/flowtable/0010delete_handle_0
+++ b/tests/shell/testcases/flowtable/0010delete_handle_0
@@ -16,7 +16,6 @@ EXPECTED="table inet t {
 
 GET="$($NFT list ruleset)"
 if [ "$EXPECTED" != "$GET" ] ; then
-	DIFF="$(which diff)"
-	[ -x $DIFF ] && $DIFF -u <(echo "$EXPECTED") <(echo "$GET")
+	$DIFF -u <(echo "$EXPECTED") <(echo "$GET")
 	exit 1
 fi
diff --git a/tests/shell/testcases/listing/0003table_0 b/tests/shell/testcases/listing/0003table_0
index 1b288e4..5060be0 100755
--- a/tests/shell/testcases/listing/0003table_0
+++ b/tests/shell/testcases/listing/0003table_0
@@ -11,15 +11,13 @@ $NFT add table test
 
 GET="$($NFT list table test)"
 if [ "$EXPECTED" != "$GET" ] ; then
-	DIFF="$(which diff)"
-	[ -x $DIFF ] && $DIFF -u <(echo "$EXPECTED") <(echo "$GET")
+	$DIFF -u <(echo "$EXPECTED") <(echo "$GET")
 	exit 1
 fi
 
 # also this way
 GET="$($NFT list table ip test)"
 if [ "$EXPECTED" != "$GET" ] ; then
-	DIFF="$(which diff)"
-	[ -x $DIFF ] && $DIFF -u <(echo "$EXPECTED") <(echo "$GET")
+	$DIFF -u <(echo "$EXPECTED") <(echo "$GET")
 	exit 1
 fi
diff --git a/tests/shell/testcases/listing/0004table_0 b/tests/shell/testcases/listing/0004table_0
index 2c7c995..1d69119 100755
--- a/tests/shell/testcases/listing/0004table_0
+++ b/tests/shell/testcases/listing/0004table_0
@@ -12,8 +12,7 @@ $NFT add table test2
 
 GET="$($NFT list table test)"
 if [ "$EXPECTED" != "$GET" ] ; then
-	DIFF="$(which diff)"
-	[ -x $DIFF ] && $DIFF -u <(echo "$EXPECTED") <(echo "$GET")
+	$DIFF -u <(echo "$EXPECTED") <(echo "$GET")
 	exit 1
 fi
 
diff --git a/tests/shell/testcases/listing/0005ruleset_ip_0 b/tests/shell/testcases/listing/0005ruleset_ip_0
index c326680..39c0328 100755
--- a/tests/shell/testcases/listing/0005ruleset_ip_0
+++ b/tests/shell/testcases/listing/0005ruleset_ip_0
@@ -15,7 +15,6 @@ $NFT add table bridge test
 
 GET="$($NFT list ruleset ip)"
 if [ "$EXPECTED" != "$GET" ] ; then
-	DIFF="$(which diff)"
-	[ -x $DIFF ] && $DIFF -u <(echo "$EXPECTED") <(echo "$GET")
+	$DIFF -u <(echo "$EXPECTED") <(echo "$GET")
 	exit 1
 fi
diff --git a/tests/shell/testcases/listing/0006ruleset_ip6_0 b/tests/shell/testcases/listing/0006ruleset_ip6_0
index 093d5a5..1b67f50 100755
--- a/tests/shell/testcases/listing/0006ruleset_ip6_0
+++ b/tests/shell/testcases/listing/0006ruleset_ip6_0
@@ -15,7 +15,6 @@ $NFT add table bridge test
 
 GET="$($NFT list ruleset ip6)"
 if [ "$EXPECTED" != "$GET" ] ; then
-	DIFF="$(which diff)"
-	[ -x $DIFF ] && $DIFF -u <(echo "$EXPECTED") <(echo "$GET")
+	$DIFF -u <(echo "$EXPECTED") <(echo "$GET")
 	exit 1
 fi
diff --git a/tests/shell/testcases/listing/0007ruleset_inet_0 b/tests/shell/testcases/listing/0007ruleset_inet_0
index b24cc4c..257c7a9 100755
--- a/tests/shell/testcases/listing/0007ruleset_inet_0
+++ b/tests/shell/testcases/listing/0007ruleset_inet_0
@@ -15,7 +15,6 @@ $NFT add table bridge test
 
 GET="$($NFT list ruleset inet)"
 if [ "$EXPECTED" != "$GET" ] ; then
-	DIFF="$(which diff)"
-	[ -x $DIFF ] && $DIFF -u <(echo "$EXPECTED") <(echo "$GET")
+	$DIFF -u <(echo "$EXPECTED") <(echo "$GET")
 	exit 1
 fi
diff --git a/tests/shell/testcases/listing/0008ruleset_arp_0 b/tests/shell/testcases/listing/0008ruleset_arp_0
index fff0fee..be42c47 100755
--- a/tests/shell/testcases/listing/0008ruleset_arp_0
+++ b/tests/shell/testcases/listing/0008ruleset_arp_0
@@ -15,7 +15,6 @@ $NFT add table bridge test
 
 GET="$($NFT list ruleset arp)"
 if [ "$EXPECTED" != "$GET" ] ; then
-	DIFF="$(which diff)"
-	[ -x $DIFF ] && $DIFF -u <(echo "$EXPECTED") <(echo "$GET")
+	$DIFF -u <(echo "$EXPECTED") <(echo "$GET")
 	exit 1
 fi
diff --git a/tests/shell/testcases/listing/0009ruleset_bridge_0 b/tests/shell/testcases/listing/0009ruleset_bridge_0
index 247ed47..c6a99f5 100755
--- a/tests/shell/testcases/listing/0009ruleset_bridge_0
+++ b/tests/shell/testcases/listing/0009ruleset_bridge_0
@@ -15,7 +15,6 @@ $NFT add table bridge test
 
 GET="$($NFT list ruleset bridge)"
 if [ "$EXPECTED" != "$GET" ] ; then
-	DIFF="$(which diff)"
-	[ -x $DIFF ] && $DIFF -u <(echo "$EXPECTED") <(echo "$GET")
+	$DIFF -u <(echo "$EXPECTED") <(echo "$GET")
 	exit 1
 fi
diff --git a/tests/shell/testcases/listing/0010sets_0 b/tests/shell/testcases/listing/0010sets_0
index 855cceb..0f5f2bd 100755
--- a/tests/shell/testcases/listing/0010sets_0
+++ b/tests/shell/testcases/listing/0010sets_0
@@ -57,7 +57,6 @@ $NFT add set inet filter set2 { type icmpv6_type \; }
 
 GET="$($NFT list sets)"
 if [ "$EXPECTED" != "$GET" ] ; then
-	DIFF="$(which diff)"
-	[ -x $DIFF ] && $DIFF -u <(echo "$EXPECTED") <(echo "$GET")
+	$DIFF -u <(echo "$EXPECTED") <(echo "$GET")
 	exit 1
 fi
diff --git a/tests/shell/testcases/listing/0011sets_0 b/tests/shell/testcases/listing/0011sets_0
index aac9eac..b6f12b5 100755
--- a/tests/shell/testcases/listing/0011sets_0
+++ b/tests/shell/testcases/listing/0011sets_0
@@ -38,7 +38,6 @@ $NFT add rule inet filter test tcp dport {80, 443}
 GET="$($NFT list sets)"
 
 if [ "$EXPECTED" != "$GET" ] ; then
-	DIFF="$(which diff)"
-	[ -x $DIFF ] && $DIFF -u <(echo "$EXPECTED") <(echo "$GET")
+	$DIFF -u <(echo "$EXPECTED") <(echo "$GET")
 	exit 1
 fi
diff --git a/tests/shell/testcases/listing/0012sets_0 b/tests/shell/testcases/listing/0012sets_0
index da16d94..6e4c959 100755
--- a/tests/shell/testcases/listing/0012sets_0
+++ b/tests/shell/testcases/listing/0012sets_0
@@ -33,7 +33,6 @@ $NFT add set inet filter set2 { type icmpv6_type \; }
 
 GET="$($NFT list sets inet)"
 if [ "$EXPECTED" != "$GET" ] ; then
-	DIFF="$(which diff)"
-	[ -x $DIFF ] && $DIFF -u <(echo "$EXPECTED") <(echo "$GET")
+	$DIFF -u <(echo "$EXPECTED") <(echo "$GET")
 	exit 1
 fi
diff --git a/tests/shell/testcases/listing/0013objects_0 b/tests/shell/testcases/listing/0013objects_0
index f691579..4d39143 100755
--- a/tests/shell/testcases/listing/0013objects_0
+++ b/tests/shell/testcases/listing/0013objects_0
@@ -42,7 +42,6 @@ $NFT add table test-ip
 
 GET="$($NFT list table test)"
 if [ "$EXPECTED" != "$GET" ] ; then
-	DIFF="$(which diff)"
-	[ -x $DIFF ] && $DIFF -u <(echo "$EXPECTED") <(echo "$GET")
+	$DIFF -u <(echo "$EXPECTED") <(echo "$GET")
 	exit 1
 fi
diff --git a/tests/shell/testcases/listing/0014objects_0 b/tests/shell/testcases/listing/0014objects_0
index 20f6840..31d94f8 100755
--- a/tests/shell/testcases/listing/0014objects_0
+++ b/tests/shell/testcases/listing/0014objects_0
@@ -17,15 +17,13 @@ $NFT add table test-ip
 
 GET="$($NFT list quotas)"
 if [ "$EXPECTED" != "$GET" ] ; then
-	DIFF="$(which diff)"
-	[ -x $DIFF ] && $DIFF -u <(echo "$EXPECTED") <(echo "$GET")
+	$DIFF -u <(echo "$EXPECTED") <(echo "$GET")
 	exit 1
 fi
 
 GET="$($NFT list quota test https-quota)"
 if [ "$EXPECTED" != "$GET" ] ; then
-	DIFF="$(which diff)"
-	[ -x $DIFF ] && $DIFF -u <(echo "$EXPECTED") <(echo "$GET")
+	$DIFF -u <(echo "$EXPECTED") <(echo "$GET")
 	exit 1
 fi
 
diff --git a/tests/shell/testcases/listing/0015dynamic_0 b/tests/shell/testcases/listing/0015dynamic_0
index 4ff74e3..65fbe62 100755
--- a/tests/shell/testcases/listing/0015dynamic_0
+++ b/tests/shell/testcases/listing/0015dynamic_0
@@ -16,8 +16,7 @@ $NFT -f - <<< "$EXPECTED"
 
 GET="$($NFT list set ip filter test_set)"
 if [ "$EXPECTED" != "$GET" ] ; then
-	DIFF="$(which diff)"
-	[ -x $DIFF ] && $DIFF -u <(echo "$EXPECTED") <(echo "$GET")
+	$DIFF -u <(echo "$EXPECTED") <(echo "$GET")
 	exit 1
 fi
 
diff --git a/tests/shell/testcases/listing/0017objects_0 b/tests/shell/testcases/listing/0017objects_0
index 8a586e8..c4e72db 100755
--- a/tests/shell/testcases/listing/0017objects_0
+++ b/tests/shell/testcases/listing/0017objects_0
@@ -13,7 +13,6 @@ $NFT flush map inet filter countermap
 
 GET="$($NFT list map inet filter countermap)"
 if [ "$EXPECTED" != "$GET" ] ; then
-	DIFF="$(which diff)"
-	[ -x $DIFF ] && $DIFF -u <(echo "$EXPECTED") <(echo "$GET")
+	$DIFF -u <(echo "$EXPECTED") <(echo "$GET")
 	exit 1
 fi
diff --git a/tests/shell/testcases/listing/0018data_0 b/tests/shell/testcases/listing/0018data_0
index 544b6bf..4af253d 100755
--- a/tests/shell/testcases/listing/0018data_0
+++ b/tests/shell/testcases/listing/0018data_0
@@ -13,7 +13,6 @@ $NFT flush map inet filter ipmap
 
 GET="$($NFT list map inet filter ipmap)"
 if [ "$EXPECTED" != "$GET" ] ; then
-	DIFF="$(which diff)"
-	[ -x $DIFF ] && $DIFF -u <(echo "$EXPECTED") <(echo "$GET")
+	$DIFF -u <(echo "$EXPECTED") <(echo "$GET")
 	exit 1
 fi
diff --git a/tests/shell/testcases/listing/0019set_0 b/tests/shell/testcases/listing/0019set_0
index 54a8a06..6e8cb4d 100755
--- a/tests/shell/testcases/listing/0019set_0
+++ b/tests/shell/testcases/listing/0019set_0
@@ -13,7 +13,6 @@ $NFT flush set inet filter ipset
 
 GET="$($NFT list set inet filter ipset)"
 if [ "$EXPECTED" != "$GET" ] ; then
-	DIFF="$(which diff)"
-	[ -x $DIFF ] && $DIFF -u <(echo "$EXPECTED") <(echo "$GET")
+	$DIFF -u <(echo "$EXPECTED") <(echo "$GET")
 	exit 1
 fi
diff --git a/tests/shell/testcases/listing/0020flowtable_0 b/tests/shell/testcases/listing/0020flowtable_0
index 6f630f1..2f0a98d 100755
--- a/tests/shell/testcases/listing/0020flowtable_0
+++ b/tests/shell/testcases/listing/0020flowtable_0
@@ -15,7 +15,6 @@ $NFT -f - <<< "$EXPECTED"
 
 GET="$($NFT list flowtable inet filter f)"
 if [ "$EXPECTED" != "$GET" ] ; then
-	DIFF="$(which diff)"
-	[ -x $DIFF ] && $DIFF -u <(echo "$EXPECTED") <(echo "$GET")
+	$DIFF -u <(echo "$EXPECTED") <(echo "$GET")
 	exit 1
 fi
diff --git a/tests/shell/testcases/maps/0003map_add_many_elements_0 b/tests/shell/testcases/maps/0003map_add_many_elements_0
index 047f949..2b254c5 100755
--- a/tests/shell/testcases/maps/0003map_add_many_elements_0
+++ b/tests/shell/testcases/maps/0003map_add_many_elements_0
@@ -61,8 +61,7 @@ EXPECTED="table ip x {
 }"
 GET=$($NFT list ruleset)
 if [ "$EXPECTED" != "$GET" ] ; then
-	DIFF="$(which diff)"
-	[ -x $DIFF ] && $DIFF -u <(echo "$EXPECTED") <(echo "$GET")
+	$DIFF -u <(echo "$EXPECTED") <(echo "$GET")
 	exit 1
 fi
 
diff --git a/tests/shell/testcases/maps/0004interval_map_create_once_0 b/tests/shell/testcases/maps/0004interval_map_create_once_0
index 58b399c..3de0c9d 100755
--- a/tests/shell/testcases/maps/0004interval_map_create_once_0
+++ b/tests/shell/testcases/maps/0004interval_map_create_once_0
@@ -60,8 +60,7 @@ EXPECTED="table ip x {
 }"
 GET=$($NFT list ruleset)
 if [ "$EXPECTED" != "$GET" ] ; then
-	DIFF="$(which diff)"
-	[ -x $DIFF ] && $DIFF -u <(echo "$EXPECTED") <(echo "$GET")
+	$DIFF -u <(echo "$EXPECTED") <(echo "$GET")
 	exit 1
 fi
 
diff --git a/tests/shell/testcases/maps/0008interval_map_delete_0 b/tests/shell/testcases/maps/0008interval_map_delete_0
index 7da6eb3..39ea312 100755
--- a/tests/shell/testcases/maps/0008interval_map_delete_0
+++ b/tests/shell/testcases/maps/0008interval_map_delete_0
@@ -26,7 +26,6 @@ $NFT add element filter m { 127.0.0.2 : 0x2 }
 
 GET=$($NFT -s list ruleset)
 if [ "$EXPECTED" != "$GET" ] ; then
-	DIFF="$(which diff)"
-	[ -x $DIFF ] && $DIFF -u <(echo "$EXPECTED") <(echo "$GET")
+	$DIFF -u <(echo "$EXPECTED") <(echo "$GET")
 	exit 1
 fi
diff --git a/tests/shell/testcases/netns/0001nft-f_0 b/tests/shell/testcases/netns/0001nft-f_0
index 8194226..a591f2c 100755
--- a/tests/shell/testcases/netns/0001nft-f_0
+++ b/tests/shell/testcases/netns/0001nft-f_0
@@ -93,8 +93,7 @@ fi
 KERNEL_RULESET="$($IP netns exec $NETNS_NAME $NFT list ruleset)"
 $IP netns del $NETNS_NAME
 if [ "$RULESET" != "$KERNEL_RULESET" ] ; then
-        DIFF="$(which diff)"
-        [ -x $DIFF ] && $DIFF -u <(echo "$RULESET") <(echo "$KERNEL_RULESET")
+        $DIFF -u <(echo "$RULESET") <(echo "$KERNEL_RULESET")
         exit 1
 fi
 exit 0
diff --git a/tests/shell/testcases/netns/0002loosecommands_0 b/tests/shell/testcases/netns/0002loosecommands_0
index 465c2e8..231f1fb 100755
--- a/tests/shell/testcases/netns/0002loosecommands_0
+++ b/tests/shell/testcases/netns/0002loosecommands_0
@@ -56,7 +56,6 @@ RULESET="table ip t {
 KERNEL_RULESET="$($IP netns exec $NETNS_NAME $NFT list ruleset)"
 $IP netns del $NETNS_NAME
 if [ "$RULESET" != "$KERNEL_RULESET" ] ; then
-        DIFF="$(which diff)"
-        [ -x $DIFF ] && $DIFF -u <(echo "$RULESET") <(echo "$KERNEL_RULESET")
+        $DIFF -u <(echo "$RULESET") <(echo "$KERNEL_RULESET")
         exit 1
 fi
diff --git a/tests/shell/testcases/netns/0003many_0 b/tests/shell/testcases/netns/0003many_0
index a5fcb5d..afe9117 100755
--- a/tests/shell/testcases/netns/0003many_0
+++ b/tests/shell/testcases/netns/0003many_0
@@ -97,8 +97,7 @@ function test_netns()
 	KERNEL_RULESET="$($IP netns exec $NETNS_NAME $NFT list ruleset)"
 	if [ "$RULESET" != "$KERNEL_RULESET" ] ; then
 		echo "E: ruleset in netns $NETNS_NAME differs from the loaded" >&2
-	        DIFF="$(which diff)"
-	        [ -x $DIFF ] && $DIFF -u <(echo "$RULESET") <(echo "$KERNEL_RULESET")
+	        $DIFF -u <(echo "$RULESET") <(echo "$KERNEL_RULESET")
 		$IP netns del $NETNS_NAME
 	        exit 1
 	fi
diff --git a/tests/shell/testcases/nft-f/0016redefines_1 b/tests/shell/testcases/nft-f/0016redefines_1
index 4c26b37..1f59f6b 100755
--- a/tests/shell/testcases/nft-f/0016redefines_1
+++ b/tests/shell/testcases/nft-f/0016redefines_1
@@ -26,8 +26,7 @@ $NFT -f - <<< "$RULESET"
 GET="$($NFT list ruleset)"
 
 if [ "$EXPECTED" != "$GET" ] ; then
-        DIFF="$(which diff)"
-        [ -x $DIFF ] && $DIFF -u <(echo "$EXPECTED") <(echo "$GET")
+        $DIFF -u <(echo "$EXPECTED") <(echo "$GET")
         exit 1
 fi
 
diff --git a/tests/shell/testcases/optionals/delete_object_handles_0 b/tests/shell/testcases/optionals/delete_object_handles_0
index a2ae422..9b65e67 100755
--- a/tests/shell/testcases/optionals/delete_object_handles_0
+++ b/tests/shell/testcases/optionals/delete_object_handles_0
@@ -37,7 +37,6 @@ table ip6 test-ip6 {
 GET="$($NFT list ruleset)"
 
 if [ "$EXPECTED" != "$GET" ] ; then
-	DIFF="$(which diff)"
-	[ -x $DIFF ] && $DIFF -u <(echo "$EXPECTED") <(echo "$GET")
+	$DIFF -u <(echo "$EXPECTED") <(echo "$GET")
 	exit 1
 fi
diff --git a/tests/shell/testcases/optionals/update_object_handles_0 b/tests/shell/testcases/optionals/update_object_handles_0
index 17c0c86..8b12b8c 100755
--- a/tests/shell/testcases/optionals/update_object_handles_0
+++ b/tests/shell/testcases/optionals/update_object_handles_0
@@ -19,7 +19,6 @@ EXPECTED="table ip test-ip {
 
 GET="$($NFT list ruleset)"
 if [ "$EXPECTED" != "$GET" ] ; then
-	DIFF="$(which diff)"
-	[ -x $DIFF ] && $DIFF -u <(echo "$EXPECTED") <(echo "$GET")
+	$DIFF -u <(echo "$EXPECTED") <(echo "$GET")
 	exit 1
 fi
diff --git a/tests/shell/testcases/rule_management/0001addinsertposition_0 b/tests/shell/testcases/rule_management/0001addinsertposition_0
index bb3fda5..237e9e3 100755
--- a/tests/shell/testcases/rule_management/0001addinsertposition_0
+++ b/tests/shell/testcases/rule_management/0001addinsertposition_0
@@ -30,8 +30,7 @@ for arg in "position 2" "handle 2" "index 0"; do
 
 	GET="$($NFT list ruleset)"
 	if [ "$EXPECTED" != "$GET" ] ; then
-		DIFF="$(which diff)"
-		[ -x $DIFF ] && $DIFF -u <(echo "$EXPECTED") <(echo "$GET")
+		$DIFF -u <(echo "$EXPECTED") <(echo "$GET")
 		exit 1
 	fi
 done
@@ -42,8 +41,7 @@ for arg in "position 3" "handle 3" "index 1"; do
 
 	GET="$($NFT list ruleset)"
 	if [ "$EXPECTED" != "$GET" ] ; then
-		DIFF="$(which diff)"
-		[ -x $DIFF ] && $DIFF -u <(echo "$EXPECTED") <(echo "$GET")
+		$DIFF -u <(echo "$EXPECTED") <(echo "$GET")
 		exit 1
 	fi
 done
@@ -62,8 +60,7 @@ for arg in "position 3" "handle 3" "index 1"; do
 
 	GET="$($NFT list ruleset)"
 	if [ "$EXPECTED" != "$GET" ] ; then
-		DIFF="$(which diff)"
-		[ -x $DIFF ] && $DIFF -u <(echo "$EXPECTED") <(echo "$GET")
+		$DIFF -u <(echo "$EXPECTED") <(echo "$GET")
 		exit 1
 	fi
 done
@@ -82,8 +79,7 @@ for arg in "position 2" "handle 2" "index 0"; do
 
 	GET="$($NFT list ruleset)"
 	if [ "$EXPECTED" != "$GET" ] ; then
-		DIFF="$(which diff)"
-		[ -x $DIFF ] && $DIFF -u <(echo "$EXPECTED") <(echo "$GET")
+		$DIFF -u <(echo "$EXPECTED") <(echo "$GET")
 		exit 1
 	fi
 done
diff --git a/tests/shell/testcases/sets/0028delete_handle_0 b/tests/shell/testcases/sets/0028delete_handle_0
index 5ad17c2..c6d1253 100755
--- a/tests/shell/testcases/sets/0028delete_handle_0
+++ b/tests/shell/testcases/sets/0028delete_handle_0
@@ -29,7 +29,6 @@ EXPECTED="table ip test-ip {
 GET="$($NFT list ruleset)"
 
 if [ "$EXPECTED" != "$GET" ] ; then
-	DIFF="$(which diff)"
-	[ -x $DIFF ] && $DIFF -u <(echo "$EXPECTED") <(echo "$GET")
+	$DIFF -u <(echo "$EXPECTED") <(echo "$GET")
 	exit 1
 fi
diff --git a/tests/shell/testcases/sets/0036add_set_element_expiration_0 b/tests/shell/testcases/sets/0036add_set_element_expiration_0
index 8dfed6c..51ed0f2 100755
--- a/tests/shell/testcases/sets/0036add_set_element_expiration_0
+++ b/tests/shell/testcases/sets/0036add_set_element_expiration_0
@@ -8,6 +8,9 @@ add element ip x y { 1.1.1.1 timeout 30s expires 15s }"
 
 test_output=$($NFT -e -f - <<< "$RULESET" 2>&1)
 
-diff -u <(echo "$test_output") <(echo "$RULESET")
+if [ "$test_output" != "$RULESET" ] ; then
+	$DIFF -u <(echo "$test_output") <(echo "$RULESET")
+	exit 1
+fi
 
 $NFT "add chain ip x c; add rule ip x c ip saddr @y"
diff --git a/tests/shell/testcases/transactions/0003table_0 b/tests/shell/testcases/transactions/0003table_0
index 6861eab..91186de 100755
--- a/tests/shell/testcases/transactions/0003table_0
+++ b/tests/shell/testcases/transactions/0003table_0
@@ -14,7 +14,6 @@ fi
 
 KERNEL_RULESET="$($NFT list ruleset)"
 if [ "" != "$KERNEL_RULESET" ] ; then
-	DIFF="$(which diff)"
 	echo "Got a ruleset, but expected empty: "
 	echo "$KERNEL_RULESET"
 	exit 1
@@ -42,7 +41,6 @@ $NFT -f - <<< "$RULESETFAIL" && exit 2
 
 KERNEL_RULESET="$($NFT list ruleset)"
 if [ "$RULESET" != "$KERNEL_RULESET" ] ; then
-        DIFF="$(which diff)"
-        [ -x $DIFF ] && $DIFF -u <(echo "$RULESET") <(echo "$KERNEL_RULESET")
+        $DIFF -u <(echo "$RULESET") <(echo "$KERNEL_RULESET")
         exit 1
 fi
diff --git a/tests/shell/testcases/transactions/0040set_0 b/tests/shell/testcases/transactions/0040set_0
index a404abc..468816b 100755
--- a/tests/shell/testcases/transactions/0040set_0
+++ b/tests/shell/testcases/transactions/0040set_0
@@ -29,8 +29,7 @@ fi
 GET="$($NFT list ruleset)"
 
 if [ "$RULESET" != "$GET" ] ; then
-	DIFF="$(which diff)"
-	[ -x $DIFF ] && $DIFF -u <(echo "$RULESET") <(echo "$GET")
+	$DIFF -u <(echo "$RULESET") <(echo "$GET")
 	exit 1
 fi