--- a/taskcluster/ci/source-test/mozlint.yml
+++ b/taskcluster/ci/source-test/mozlint.yml
@@ -1,9 +1,10 @@
 job-defaults:
+    always-target: true
     treeherder:
         kind: test
         tier: 1
     worker-type: aws-provisioner-v1/gecko-t-linux-xlarge
     worker:
         docker-image: {in-tree: "lint"}
         max-run-time: 1800
     run:

--- a/taskcluster/ci/source-test/python.yml
+++ b/taskcluster/ci/source-test/python.yml
@@ -1,10 +1,11 @@
 job-defaults:
     platform: linux64/opt
+    always-target: true
     worker-type:
         by-platform:
             linux64.*: aws-provisioner-v1/gecko-t-linux-xlarge
     treeherder:
         kind: test
         tier: 2
     run:
         using: mach
@@ -47,16 +48,17 @@ marionette-harness:
 
 mochitest-harness:
     description: testing/mochitest unittests
     platform:
         - linux64/opt
         - linux64/debug
         - linux64-asan/opt
     require-build: true
+    always-target: false
     treeherder:
         symbol: py(mch)
     worker:
         by-platform:
             linux64.*:
                 docker-image: {in-tree: "desktop1604-test"}
                 max-run-time: 3600
     run:
@@ -144,16 +146,17 @@ mozversioncontrol:
 
 reftest-harness:
     description: layout/tools/reftest unittests
     platform:
         - linux64/opt
         - linux64/debug
         - linux64-asan/opt
     require-build: true
+    always-target: false
     treeherder:
         symbol: py(ref)
     worker:
         by-platform:
             linux64.*:
                 docker-image: {in-tree: "desktop1604-test"}
                 max-run-time: 3600
     run: