diff --git a/llvm/test/Scripts/grep-not b/llvm/test/Scripts/grep-not
index 7fe67028cc08..9ea9bf0de6f5 100755
--- a/llvm/test/Scripts/grep-not
+++ b/llvm/test/Scripts/grep-not
@@ -10,7 +10,7 @@
 #
 # Syntax:   The same as grep
 
-if grep $@
+if grep "$@"
 then exit 1
 else exit 0
 fi