diff --git a/test.sh b/test.sh
index b4afb03..d0010a6 100755
--- a/test.sh
+++ b/test.sh
@@ -32,5 +32,5 @@ function myfunc()
 	echo "ok"
 }
 
-if [ ${(detect_os OS)[1]} = "debian" ]; then echo 'YES'; fi
+if [ "${(detect_os OS)[1]}" = "debian" ]; then echo 'YES'; fi