diff --git a/test/uniqueId.js b/test/uniqueId.test.js
similarity index 100%
rename from test/uniqueId.js
rename to test/uniqueId.test.js
diff --git a/uniqueId.js b/uniqueId.js
index 0c7022ea2..934ece290 100644
--- a/uniqueId.js
+++ b/uniqueId.js
@@ -27,7 +27,7 @@ function uniqueId(prefix='$lodash$') {
     return `${id}`
   }
 
-  return `${prefix + id}`
+  return `${prefix}${id}`
 }
 
 export default uniqueId