--- a/taskcluster/ci/legacy/tasks/builds/android_api_15_gradle.yml
+++ b/taskcluster/ci/legacy/tasks/builds/android_api_15_gradle.yml
@@ -32,16 +32,17 @@ task:
       # inputs to mozharness
       MOZHARNESS_SCRIPT: 'mozharness/scripts/fx_desktop_build.py'
       # TODO: make these additional configuration files go away
       MOZHARNESS_CONFIG: >
           builds/releng_base_android_64_builds.py
           disable_signing.py
           platform_supports_post_upload_to_latest.py
       MOZHARNESS_ACTIONS: "get-secrets build multi-l10n update"
+      TOOLTOOL_CACHE: /home/worker/tooltool-cache
       MH_CUSTOM_BUILD_VARIANT_CFG: api-15-gradle
       MH_BRANCH: {{project}}
       MH_BUILD_POOL: taskcluster
       GRADLE_USER_HOME: '/home/worker/workspace/build/src/dotgradle'
 
     command: ["/bin/bash", "bin/build.sh"]
 
   extra: