--- a/taskcluster/ci/test/test-platforms.yml
+++ b/taskcluster/ci/test/test-platforms.yml
@@ -159,21 +159,21 @@ windows10-64-asan/opt:
 ##
 # MacOS X platforms (matching /macosx.*/)
 
 macosx64/debug:
     build-platform: macosx64/debug
     test-sets:
         - macosx64-tests-debug
 
-# macosx64/opt:
-#     build-platform: macosx64/opt
-#     test-sets:
-#         - macosx64-tests-talos
-#         - macosx64-tests-debug
+macosx64/opt:
+    build-platform: macosx64/opt
+    test-sets:
+        - macosx64-tests-talos
+        - macosx64-tests-debug
 
 ##
 # Android platforms (matching /android.*/)
 
 android-4.3-arm7-api-15/debug:
     build-platform: android-api-15/debug
     test-sets:
         - android-common-tests

--- a/testing/mozharness/configs/builds/releng_base_mac_64_builds.py
+++ b/testing/mozharness/configs/builds/releng_base_mac_64_builds.py
@@ -26,18 +26,18 @@ config = {
     # decides whether we want to use moz_sign_cmd in env
     'enable_signing': True,
     'enable_ccache': True,
     'vcs_share_base': '/builds/hg-shared',
     'objdir': 'obj-firefox',
     'tooltool_script': ["/builds/tooltool.py"],
     'tooltool_bootstrap': "setup.sh",
     'enable_count_ctors': False,
-    'enable_talos_sendchange': True,
-    'enable_unittest_sendchange': True,
+    'enable_talos_sendchange': False,
+    'enable_unittest_sendchange': False,
     #########################################################################
 
 
     #########################################################################
     ###### 64 bit specific ######
     'base_name': 'OS X 10.7 %(branch)s',
     'platform': 'macosx64',
     'stage_platform': 'macosx64',