diff --git a/synchronize.py b/synchronize.py
index 488a849..3db3e00 100644
--- a/synchronize.py
+++ b/synchronize.py
@@ -1061,5 +1061,5 @@ def make_parser() -> argparse.ArgumentParser:
         user_data=command_args.userdata_file,
         cloud=openstack_cloud,
         dry_run=command_args.dry_run,
-        vars_files=(Path("secrets.yml"), *command_args.vars_files),
+        vars_files=(Path("secrets.yaml"), *command_args.vars_files),
     )