diff --git a/google/colab/output/_js_builder.py b/google/colab/output/_js_builder.py
index d6beb941..3260b187 100644
--- a/google/colab/output/_js_builder.py
+++ b/google/colab/output/_js_builder.py
@@ -98,7 +98,7 @@ def _get_javascript_runner(self, mode):
       # This allows us to properly chain function and javascript class
       # (since those are not serializable) and eliminates the need to wait
       # for frontend to return.
-      return lambda x: _js.eval_js('(()=>{' + x + '})()', ignore_result=True)
+      return lambda x: _js.eval_js('(()=>{' + x + '})();', ignore_result=True)
     else:
       raise JsException('Invalid mode: %r.' % mode)