diff --git a/zarr/storage.py b/zarr/storage.py
index 6720b42d12..65afc58539 100644
--- a/zarr/storage.py
+++ b/zarr/storage.py
@@ -778,7 +778,7 @@ def __setitem__(self, key, value):
 
         finally:
             # clean up if temp file still exists for whatever reason
-            if temp_path is not None and os.path.exists(temp_path):
+            if temp_path is not None and os.path.exists(temp_path):  # pragma: no cover
                 os.remove(temp_path)
 
     def __delitem__(self, key):