diff --git a/buildbot/master/files/config/steps.yml b/buildbot/master/files/config/steps.yml
index 9c0e0f87..b7293ecf 100644
--- a/buildbot/master/files/config/steps.yml
+++ b/buildbot/master/files/config/steps.yml
@@ -45,6 +45,7 @@ linux-dev:
   - ./mach test-unit
   - ./mach build-cef
   - ./mach build-geckolib
+  - ./mach test-stylo
   - bash ./etc/ci/lockfile_changed.sh
   - bash ./etc/ci/manifest_changed.sh
   - bash ./etc/ci/check_no_unwrap.sh