diff --git a/pterostats-egg.json b/pterostats-egg.json
index ff35981..03e92eb 100644
--- a/pterostats-egg.json
+++ b/pterostats-egg.json
@@ -39,7 +39,7 @@
             "default_value": "",
             "user_viewable": true,
             "user_editable": true,
-            "rules": "nullable,string,max:64"
+            "rules": "nullable|string|max:64"
         }
     ]
 }
\ No newline at end of file