diff --git a/examples/gio-cat.js b/examples/gio-cat.js
index c2c3bfe..5fc022b 100644
--- a/examples/gio-cat.js
+++ b/examples/gio-cat.js
@@ -14,7 +14,7 @@ function cat(filename) {
         }
         print(contents);
         Mainloop.quit('');
-    }, null);
+    });
 
     Mainloop.run('');
 }
