diff --git a/lib/utils/common.js b/lib/utils/common.js
index fe6770f..cfcaea6 100644
--- a/lib/utils/common.js
+++ b/lib/utils/common.js
@@ -31,7 +31,7 @@ class common extends utils {
   }
 
   static quote (s) {
-    return jsesc(s)
+    return `'${jsesc(s)}'`
   }
 
   static b64encode (str) {