diff --git a/buildbot/restart-workers b/buildbot/restart-workers
index 4415c7d1e..7e62828ce 100755
--- a/buildbot/restart-workers
+++ b/buildbot/restart-workers
@@ -1,3 +1,3 @@
 #!/bin/bash
 
-for d in workers/*; do ( cd $d; . env/bin/activate; buildbot-worker restart; ); done
+for d in ${1:-workers/*}; do ( cd $d; . env/bin/activate; buildbot-worker restart; ); done