diff --git a/google/colab/_import_hooks/_generativeai.py b/google/colab/_import_hooks/_generativeai.py
index e945a293..3ed833da 100644
--- a/google/colab/_import_hooks/_generativeai.py
+++ b/google/colab/_import_hooks/_generativeai.py
@@ -91,7 +91,7 @@ async def _handle_request(self):
                 self.set_status(int(result['error']['code']))
                 self.write(result['error']['message'])
                 return
-              self.write(result)
+              self.write(json.dumps(result))
             except Exception as e:  # pylint:disable=broad-except
               self.set_status(500)
               self.write(str(e))