diff --git a/master/custom/builders.py b/master/custom/builders.py
index ea1a4757..498f4d3d 100644
--- a/master/custom/builders.py
+++ b/master/custom/builders.py
@@ -334,7 +334,8 @@
 def get_builders(settings):
     # Override with a default simple worker if we are using local workers
     if settings.use_local_worker:
-        return [("Test Builder", "local-worker", UnixBuild, STABLE, NO_TIER)]
+        local_buildfactory = globals().get(settings.local_worker_buildfactory, UnixBuild)
+        return [("Test Builder", "local-worker", local_buildfactory, STABLE, NO_TIER)]
 
     all_builders = []
     for builders, stability, tier in (