--- a/taskcluster/ci/legacy/tasks/builds/android_api_15.yml
+++ b/taskcluster/ci/legacy/tasks/builds/android_api_15.yml
@@ -35,16 +35,17 @@ task:
       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"
       MH_CUSTOM_BUILD_VARIANT_CFG: api-15
       MH_BRANCH: {{project}}
       MH_BUILD_POOL: taskcluster
+      TOOLTOOL_CACHE: '/home/worker/tooltool-cache'
 
     command: ["/bin/bash", "bin/build.sh"]
 
   extra:
     treeherderEnv:
       - production
       - staging
     treeherder:

--- a/taskcluster/ci/legacy/tasks/builds/android_api_15_debug.yml
+++ b/taskcluster/ci/legacy/tasks/builds/android_api_15_debug.yml
@@ -35,16 +35,17 @@ task:
       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"
       MH_CUSTOM_BUILD_VARIANT_CFG: api-15-debug
       MH_BRANCH: {{project}}
       MH_BUILD_POOL: taskcluster
+      TOOLTOOL_CACHE: '/home/worker/tooltool-cache'
 
     command: ["/bin/bash", "bin/build.sh"]
 
   extra:
     treeherderEnv:
       - production
       - staging
     treeherder:

--- a/taskcluster/ci/legacy/tasks/builds/android_api_15_gradle_dependencies.yml
+++ b/taskcluster/ci/legacy/tasks/builds/android_api_15_gradle_dependencies.yml
@@ -40,16 +40,17 @@ task:
           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"
       MH_CUSTOM_BUILD_VARIANT_CFG: api-15-gradle-dependencies
       MH_BRANCH: {{project}}
       MH_BUILD_POOL: taskcluster
       GRADLE_USER_HOME: '/home/worker/workspace/build/src/dotgradle-online'
+      TOOLTOOL_CACHE: '/home/worker/tooltool-cache'
 
     maxRunTime: 36000
 
     image:
       type: 'task-image'
       path: 'public/image.tar'
       taskId:
         task-reference: "<docker-image>"

--- a/taskcluster/ci/legacy/tasks/builds/android_api_15_partner_sample1.yml
+++ b/taskcluster/ci/legacy/tasks/builds/android_api_15_partner_sample1.yml
@@ -35,16 +35,17 @@ task:
       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'
       MH_CUSTOM_BUILD_VARIANT_CFG: api-15-partner-sample1
       MH_BRANCH: {{project}}
       MH_BUILD_POOL: taskcluster
+      TOOLTOOL_CACHE: '/home/worker/tooltool-cache'
 
       # space separated list of repositories required for this build
       # for each ITEM in list you want checked out, you must also supply tc-vcs args:
       # e.g. ${ITEM}_BASE_REPOSITORY
       EXTRA_CHECKOUT_REPOSITORIES: >
           PARTNER
 
       PARTNER_BASE_REPOSITORY: 'https://github.com/mozilla/fennec-distribution-sample'

--- a/taskcluster/ci/legacy/tasks/builds/android_x86.yml
+++ b/taskcluster/ci/legacy/tasks/builds/android_x86.yml
@@ -35,16 +35,17 @@ task:
       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"
       MH_CUSTOM_BUILD_VARIANT_CFG: x86
       MH_BRANCH: {{project}}
       MH_BUILD_POOL: taskcluster
+      TOOLTOOL_CACHE: /home/worker/tooltool-cache
 
     command: ["/bin/bash", "bin/build.sh"]
 
   extra:
     treeherderEnv:
       - production
       - staging
     treeherder: