diff --git a/testing/taskcluster/tasks/builds/b2g_desktop_debug.yml b/testing/taskcluster/tasks/builds/b2g_desktop_debug.yml
index eacbe2f2ac7b..46a6d3e3c021 100644
--- a/testing/taskcluster/tasks/builds/b2g_desktop_debug.yml
+++ b/testing/taskcluster/tasks/builds/b2g_desktop_debug.yml
@@ -6,7 +6,7 @@ $inherits:
 task:
   scopes:
       - 'docker-worker:cache:workspace-b2g-desktop-objects-debug'
-
+  workerType: b2g-desktop-debug
   extra:
     treeherder:
       collection:
diff --git a/testing/taskcluster/tasks/builds/b2g_desktop_opt.yml b/testing/taskcluster/tasks/builds/b2g_desktop_opt.yml
index ea8139f58a32..ffd715035cbf 100644
--- a/testing/taskcluster/tasks/builds/b2g_desktop_opt.yml
+++ b/testing/taskcluster/tasks/builds/b2g_desktop_opt.yml
@@ -6,7 +6,7 @@ $inherits:
 task:
   scopes:
       - 'docker-worker:cache:workspace-b2g-desktop-objects-opt'
-
+  workerType: b2g-desktop-opt
   payload:
     cache:
       workspace-b2g-desktop-objects-opt: '/home/worker/workspace'
diff --git a/testing/taskcluster/tasks/builds/mulet_linux.yml b/testing/taskcluster/tasks/builds/mulet_linux.yml
index 5cbb777c8aaa..c753568c753c 100644
--- a/testing/taskcluster/tasks/builds/mulet_linux.yml
+++ b/testing/taskcluster/tasks/builds/mulet_linux.yml
@@ -5,7 +5,7 @@ task:
     name: '[TC] Mulet Linux'
     description: Mulet Linux
 
-  workerType: b2gbuild-desktop
+  workerType: mulet-opt
   scopes:
     - 'docker-worker:cache:build-mulet-linux-workspace'
     - 'docker-worker:cache:tooltool-cache'
@@ -43,4 +43,3 @@ task:
     locations:
       build: 'public/build/target.linux-x86_64.tar.bz2'
       tests: 'public/build/target.tests.zip'
-