diff --git a/pre_commit/store.py b/pre_commit/store.py
index 5f767346..a205a84a 100644
--- a/pre_commit/store.py
+++ b/pre_commit/store.py
@@ -44,7 +44,7 @@ class Store(object):
 
         @cached_property
         def repo_path(self):
-            return self._store.initialize_repo(self._repo, self._sha)
+            return self._store.initialize_repo(self._repo, self._ref)
 
     def __init__(self, directory=None):
         if directory is None: