diff --git a/action.yml b/action.yml
index e7427bf..500eed1 100644
--- a/action.yml
+++ b/action.yml
@@ -39,7 +39,7 @@ inputs:
   container-name:
     description: 'MongoDB container name (default: "mongodb")'
     required: false
-    default: "mongodb"
+    default: 'mongodb'
 
 runs:
   using: 'docker'