diff --git a/gunpowder/nodes/zarr_source.py b/gunpowder/nodes/zarr_source.py
index f4c19c75..812769f3 100644
--- a/gunpowder/nodes/zarr_source.py
+++ b/gunpowder/nodes/zarr_source.py
@@ -107,7 +107,10 @@ def _get_offset(self, dataset):
 
     def _rev_metadata(self):
         with ZarrFile(self.store, mode="a") as store:
-            return isinstance(store, N5Store) or isinstance(store, N5FSStore)
+            return (
+                isinstance(store.chunk_store, N5Store) or
+                isinstance(store.chunk_store, N5FSStore)
+            )
 
     def _open_file(self, store):
         return ZarrFile(store, mode="r")