diff --git a/coverage.sh b/coverage.sh
index 6686b44..d582f92 100755
--- a/coverage.sh
+++ b/coverage.sh
@@ -17,6 +17,11 @@ if [ -z "$(echo $CC | grep "gcc")" ]; then
     exit 0
 fi
 
+if [ "$(echo $2 | grep -v 'makefile[.]')" == "" ]; then
+    echo "only run coverage for the regular makefile, early exit success"
+    exit 0
+fi
+
 # output version
 bash printinfo.sh