diff --git a/dvc/repo/index.py b/dvc/repo/index.py
index 50ab5d136..38fddea8b 100644
--- a/dvc/repo/index.py
+++ b/dvc/repo/index.py
@@ -363,7 +363,7 @@ class Index:
         if index is None:
             index = DataIndex()
 
-        prefix = (self.data_tree.hash_info.value,)
+        prefix = ("tree", self.data_tree.hash_info.value)
         if prefix in index.ls((), detail=False):
             loaded = True