--- a/testing/mozharness/configs/talos/windows_config.py
+++ b/testing/mozharness/configs/talos/windows_config.py
@@ -38,11 +38,12 @@ config = {
         "run-tests",
     ],
     "default_blob_upload_servers": [
         "https://blobupload.elasticbeanstalk.com",
     ],
     "blob_uploader_auth_file": os.path.join(os.getcwd(), "oauth.txt"),
     "metro_harness_path_frmt": "%(metro_base_path)s/metro/metrotestharness.exe",
     "download_minidump_stackwalk": True,
+    "tooltool_cache": os.path.join('c:\\', 'build', 'tooltool_cache'),
     "minidump_stackwalk_path": "win32-minidump_stackwalk.exe",
     "minidump_tooltool_manifest_path": "config/tooltool-manifests/win32/releng.manifest",
 }