diff --git a/doc/test_no_new_rst.py b/doc/test_no_new_rst.py
index 1f830340bc1b..68077206723b 100644
--- a/doc/test_no_new_rst.py
+++ b/doc/test_no_new_rst.py
@@ -26,7 +26,7 @@ def _list_added_files(base: str, commit: str, remote: str = "origin") -> List[st
             "diff",
             "--name-only",
             "--diff-filter=A",
-            f"{remote}/{base}...{commit}",
+            f"FETCH_HEAD...{commit}",
             "--",
         ],
         text=True,