diff --git a/etc/taskcluster/decision_task.py b/etc/taskcluster/decision_task.py
index 36a9d3b1d01..dcf879c15eb 100644
--- a/etc/taskcluster/decision_task.py
+++ b/etc/taskcluster/decision_task.py
@@ -765,6 +765,9 @@ def macos_build_task(name):
         .with_repo()
         .with_python2()
         .with_rustup()
+        # Debugging for surprising generic-worker behaviour
+        .with_early_script("ls")
+        .with_script("ls target")
     )
     return (
         with_homebrew(build_task, [