diff --git a/buildbot_nix/__init__.py b/buildbot_nix/__init__.py
index e359f59..25a1b4f 100644
--- a/buildbot_nix/__init__.py
+++ b/buildbot_nix/__init__.py
@@ -152,7 +152,7 @@ class BuildTrigger(steps.BuildStep):
         return sch
 
     def schedule_one(self, build_props: Properties, job):
-        project_name = build_props.getProperty('event.project')
+        project_name = build_props.getProperty("event.refUpdate.project")
         source = f"{project_name}-eval"
         attr = job.get("attr", "eval-error")
         name = f"buildbotJobs.{attr}"