diff --git a/update_repo.py b/update_repo.py
index 5a7163c..8766afe 100755
--- a/update_repo.py
+++ b/update_repo.py
@@ -53,7 +53,7 @@ class Repo:
     
     def delete(self, ref:str):
         assert isinstance(ref, str)
-        os.remove(os.join(self._repo, "refs", "heads", *(ref.split("/"))))
+        os.remove(os.path.join(self._repo, "refs", "heads", *(ref.split("/"))))
 
 
 if __name__ == "__main__":