diff --git a/aider/repomap.py b/aider/repomap.py
index 5b565c858..4ad42011c 100644
--- a/aider/repomap.py
+++ b/aider/repomap.py
@@ -178,7 +178,7 @@ class RepoMap:
 
         # Load the tags queries
         scm_fname = pkg_resources.resource_filename(
-            __name__, f"../queries/tree-sitter-{lang}-tags.scm"
+            __name__, os.path.join("..", "queries", f"tree-sitter-{lang}-tags.scm")
         )
         query_scm = Path(scm_fname)
         if not query_scm.exists():