diff --git a/etc/taskcluster/decision_task.py b/etc/taskcluster/decision_task.py
index 8d8ebdb4970..727778bb63f 100644
--- a/etc/taskcluster/decision_task.py
+++ b/etc/taskcluster/decision_task.py
@@ -210,6 +210,7 @@ def linux_tidy_unit():
             python3 ./mach build --dev --features layout-2020
             python3 ./mach build --dev --libsimpleservo
             python3 ./mach build --dev -p servo-gst-plugin
+            python3 ./mach build --dev --media-stack=dummy
             python3 ./mach test-tidy --no-progress --self-test
 
             ./etc/memory_reports_over_time.py --test