diff --git a/include/rule.h b/include/rule.h
index 0b2eba3..47eb29f 100644
--- a/include/rule.h
+++ b/include/rule.h
@@ -363,6 +363,11 @@ static inline bool set_is_meter(uint32_t set_flags)
 	return set_is_anonymous(set_flags) && (set_flags & NFT_SET_EVAL);
 }
 
+static inline bool set_is_interval(uint32_t set_flags)
+{
+	return set_flags & NFT_SET_INTERVAL;
+}
+
 #include <statement.h>
 
 struct counter {
diff --git a/src/monitor.c b/src/monitor.c
index 0da9858..fb803cf 100644
--- a/src/monitor.c
+++ b/src/monitor.c
@@ -500,7 +500,7 @@ static int netlink_events_obj_cb(const struct nlmsghdr *nlh, int type,
 
 static void rule_map_decompose_cb(struct set *s, void *data)
 {
-	if (s->flags & (NFT_SET_INTERVAL & NFT_SET_ANONYMOUS))
+	if (set_is_interval(s->flags) && set_is_anonymous(s->flags))
 		interval_map_decompose(s->init);
 }
 
diff --git a/tests/monitor/testcases/set-interval.t b/tests/monitor/testcases/set-interval.t
index 59930c5..1fbcfe2 100644
--- a/tests/monitor/testcases/set-interval.t
+++ b/tests/monitor/testcases/set-interval.t
@@ -18,3 +18,8 @@ J {"add": {"element": {"family": "ip", "table": "t", "name": "s", "elem": {"set"
 I add rule ip t c tcp dport @s
 O -
 J {"add": {"rule": {"family": "ip", "table": "t", "chain": "c", "handle": 0, "expr": [{"match": {"op": "==", "left": {"payload": {"protocol": "tcp", "field": "dport"}}, "right": "@s"}}]}}}
+
+# test anonymous interval sets as well
+I add rule ip t c tcp dport { 20, 30-40 }
+O -
+J {"add": {"rule": {"family": "ip", "table": "t", "chain": "c", "handle": 0, "expr": [{"match": {"op": "==", "left": {"payload": {"protocol": "tcp", "field": "dport"}}, "right": {"set": [20, {"range": [30, 40]}]}}}]}}}