--- a/testing/marionette/client/marionette_driver/errors.py
+++ b/testing/marionette/client/marionette_driver/errors.py
@@ -1,19 +1,15 @@
 # This Source Code Form is subject to the terms of the Mozilla Public
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
 import traceback
 
 
-class InstallGeckoError(Exception):
-    pass
-
-
 class MarionetteException(Exception):
 
     """Raised when a generic non-recoverable exception has occured."""
 
     status = "webdriver error"
 
     def __init__(self, message=None, cause=None, stacktrace=None):
         """Construct new MarionetteException instance.