diff --git a/.taskcluster.yml b/.taskcluster.yml
index d7ea84d0312..7bd72ca6bfd 100644
--- a/.taskcluster.yml
+++ b/.taskcluster.yml
@@ -4,33 +4,34 @@ policy:
   pullRequests: collaborators
 tasks:
   - $if: 'tasks_for == "github-push"'
-    provisionerId: aws-provisioner-v1
-    workerType: github-worker
-    created: {$fromNow: ''}
-    deadline: {$fromNow: '1 hour'}
-    metadata:
-      name: "Taskcluster experiments for Servo"
-      description: "Initial task"
-      owner: ${event.pull_request.user.login}@users.noreply.github.com
-      source: ${event.compare}
+    then:
+      provisionerId: aws-provisioner-v1
+      workerType: github-worker
+      created: {$fromNow: ''}
+      deadline: {$fromNow: '1 hour'}
+      metadata:
+        name: "Taskcluster experiments for Servo"
+        description: "Initial task"
+        owner: ${event.pull_request.user.login}@users.noreply.github.com
+        source: ${event.compare}
 
-    routes:
-      - "index.servo.taskcluster-experiments"
+      routes:
+        - "index.servo.taskcluster-experiments"
 
-    payload:
-      maxRunTime: 600
-      image: "node:8"
-      env:
-        DEBUG: "* -mocha* -nock* -express* -body-parser* -eslint*"
-      features:
-        taskclusterProxy: true
-      command:
-        - /bin/bash
-        - '--login'
-        - '-c'
-        - >-
-          git clone ${event.pull_request.head.repo.clone_url} repo &&
-          cd repo &&
-          git checkout ${event.push.after} &&
-          echo "Hello World!" &&
-          ls
+      payload:
+        maxRunTime: 600
+        image: "node:8"
+        env:
+          DEBUG: "* -mocha* -nock* -express* -body-parser* -eslint*"
+        features:
+          taskclusterProxy: true
+        command:
+          - /bin/bash
+          - '--login'
+          - '-c'
+          - >-
+            git clone ${event.pull_request.head.repo.clone_url} repo &&
+            cd repo &&
+            git checkout ${event.push.after} &&
+            echo "Hello World!" &&
+            ls