diff --git a/moto/ec2/responses/__init__.py b/moto/ec2/responses/__init__.py
index 7da82d3f6..4aa9d8b83 100644
--- a/moto/ec2/responses/__init__.py
+++ b/moto/ec2/responses/__init__.py
@@ -52,4 +52,4 @@ class EC2Response(object):
                 response = sub_response(querystring)
                 method = getattr(response, action)
                 return method()
-        import pdb;pdb.set_trace()
+        raise NotImplementedError("The {} action has not been implemented".format(action))