diff --git a/application/palemoon/components/preferences/permissions.js b/application/palemoon/components/preferences/permissions.js
index 8f559b0e02..4b1bf41b2e 100644
--- a/application/palemoon/components/preferences/permissions.js
+++ b/application/palemoon/components/preferences/permissions.js
@@ -304,7 +304,7 @@ var gPermissionManager = {
         this._handleCapabilityChange();
       }
       else if (aData == "deleted") {
-        this._removePermissionFromList(permission);
+        this._removePermissionFromList(permission.principal);
       }
     }
   },