diff --git a/zuul/executor/server.py b/zuul/executor/server.py
index 674fc80..82e7bf4 100644
--- a/zuul/executor/server.py
+++ b/zuul/executor/server.py
@@ -936,7 +936,7 @@
                     "non-trusted repo." % (entry, path))
 
     def findPlaybook(self, path, required=False, trusted=False):
-        for ext in ['.yaml', '.yml']:
+        for ext in ['', '.yaml', '.yml']:
             fn = path + ext
             if os.path.exists(fn):
                 if not trusted: