diff --git a/taskcluster/taskgraph/__init__.py b/taskcluster/taskgraph/__init__.py
index eb378e38f860..9eac43574d2b 100644
--- a/taskcluster/taskgraph/__init__.py
+++ b/taskcluster/taskgraph/__init__.py
@@ -6,7 +6,7 @@ from __future__ import absolute_import, print_function, unicode_literals
 
 import os
 
-GECKO = os.path.realpath(os.path.join(__file__, '..', '..', '..'))
+GECKO = os.path.normpath(os.path.realpath(os.path.join(__file__, '..', '..', '..')))
 
 # Maximum number of dependencies a single task can have
 # https://docs.taskcluster.net/reference/platform/taskcluster-queue/references/api#createTask