--- a/taskcluster/ci/legacy/tasks/builds/dbg_macosx64.yml
+++ b/taskcluster/ci/legacy/tasks/builds/dbg_macosx64.yml
@@ -13,10 +13,11 @@ task:
   payload:
     env:
       MH_CUSTOM_BUILD_VARIANT_CFG: 'cross-debug'
   extra:
     treeherder:
       groupSymbol: tc
       groupName: Submitted by taskcluster
       symbol: B
+      tier: 2
       collection:
         debug: true

--- a/taskcluster/ci/legacy/tasks/builds/opt_macosx64.yml
+++ b/taskcluster/ci/legacy/tasks/builds/opt_macosx64.yml
@@ -4,8 +4,15 @@
     build_name: 'macosx64'
     build_type: 'opt'
 task:
   metadata:
       name: '[TC] MacOSX64 Opt'
       description: 'MacOSX64 Opt'
 
   workerType: opt-macosx64
+
+  extra:
+    treeherder:
+      groupSymbol: tc
+      groupName: Submitted by taskcluster
+      symbol: B
+      tier: 2