diff --git a/.storybook/withSource.js b/.storybook/withSource.js
index c64034c..48f9484 100644
--- a/.storybook/withSource.js
+++ b/.storybook/withSource.js
@@ -28,7 +28,7 @@ export function templateSourceCode(
       case "string":
         return `${key}="${val}"`
       default:
-        return `:${key}="${val}"`
+        return `:${key}='${(JSON.stringify(val, null, 2))}'`
     }
   }