diff --git a/Makefile b/Makefile
index bd28c43..cdf2f24 100644
--- a/Makefile
+++ b/Makefile
@@ -24,7 +24,9 @@ endif
 
 include $(MAKEFILE_COMMON)
 
+ifdef CURL
 CURL += -k
+endif
 
 MONOTONE = mtn