--- a/configs/builds/releng_sub_mac_configs/64_stat_and_debug.py
+++ b/configs/builds/releng_sub_mac_configs/64_stat_and_debug.py
@@ -9,16 +9,18 @@ config = {
         # 'setup-mock',
         'build',
         # 'generate-build-stats',
         'update',  # decided by query_is_nightly()
     ],
     'debug_build': True,
     'stage_platform': 'macosx64-st-an-debug',
     'purge_minsize': 12,
+    'tooltool_manifest_src': "browser/config/tooltool-manifests/macosx64/\
+clang.manifest",
     'platform_supports_post_upload_to_latest': False,
     'enable_signing': False,
     'enable_talos_sendchange': False,
     'enable_unittest_sendchange': False,
     'objdir': MOZ_OBJDIR,
     #### 64 bit build specific #####
     'env': {
         'MOZBUILD_STATE_PATH': os.path.join(os.getcwd(), '.mozbuild'),