diff --git a/src/spec-node/featuresCLI/utils.ts b/src/spec-node/featuresCLI/utils.ts
index 6397c1c1..d72cb170 100644
--- a/src/spec-node/featuresCLI/utils.ts
+++ b/src/spec-node/featuresCLI/utils.ts
@@ -98,7 +98,7 @@ checkMultiple() {
     shift; MINIMUMPASSED=$1
     shift; EXPRESSION="$1"
     while [ "$EXPRESSION" != "" ]; do
-        if $EXPRESSION; then ((PASSED++)); fi
+        if $EXPRESSION; then ((PASSED+=1)); fi
         shift; EXPRESSION=$1
     done
     if [ $PASSED -ge $MINIMUMPASSED ]; then