diff --git a/.taskcluster.yml b/.taskcluster.yml
index 84a828159b2db6e..4bfec9d344d3137 100644
--- a/.taskcluster.yml
+++ b/.taskcluster.yml
@@ -112,7 +112,7 @@ tasks:
                 - /bin/bash
                 - --login
                 - -c
-                - "set -e
-                  ~/provision.sh ${browser.name}-${browser.channel} ${event.repository.url} refs/pull/${event.number}/head
+                - "set -ex
+                  ~/provision.sh ${browser.name}-${browser.channel} ${event.repository.url} refs/pull/${event.number}/head &&
                   cd ~/web-platform-tests &&
                   ${operation.command}"