--- a/taskcluster/ci/legacy/tasks/builds/haz_linux.yml
+++ b/taskcluster/ci/legacy/tasks/builds/haz_linux.yml
@@ -44,16 +44,17 @@ task:
       - staging
     treeherder:
       machine:
         # see https://github.com/mozilla/treeherder/blob/master/ui/js/values.js
         platform: linux64
       groupSymbol: tc
       groupName: Submitted by taskcluster for your pleasure
       symbol: H
+      tier: 1
       collection:
         debug: true
     # Rather then enforcing particular conventions we require that all build
     # tasks provide the "build" extra field to specify where the build and tests
     # files are located.
     locations:
       build: null
       tests: null

--- a/taskcluster/ci/legacy/tasks/builds/sm_base.yml
+++ b/taskcluster/ci/legacy/tasks/builds/sm_base.yml
@@ -28,14 +28,15 @@ task:
       - staging
       - production
     treeherder:
       groupSymbol: SM-tc
       groupName: Spider Monkey, submitted by taskcluster
       machine:
         # see https://github.com/mozilla/treeherder/blob/master/ui/js/values.js
         platform: linux64
+      tier: 1
     # Rather then enforcing particular conventions we require that all build
     # tasks provide the "build" extra field to specify where the build and tests
     # files are located.
     locations:
       build: 'public/build/target.spidermonkey.tar.bz2'
       tests: 'public/build/target.spidermonkey.tar.bz2'