--- a/testing/taskcluster/mach_commands.py
+++ b/testing/taskcluster/mach_commands.py
@@ -565,17 +565,17 @@ class Graph(object):
                     print_task(task)
             return
 
         # When we are extending the graph remove extra fields...
         if params['ci'] is True:
             graph.pop('scopes', None)
             graph.pop('metadata', None)
 
-        print(json.dumps(graph, indent=4))
+        print(json.dumps(graph, indent=4, sort_keys=True))
 
 @CommandProvider
 class CIBuild(object):
     @Command('taskcluster-build', category='ci',
         description="Create taskcluster try server build task")
     @CommandArgument('--base-repository',
         help='URL for "base" repository to clone')
     @CommandArgument('--head-repository',