diff --git a/aider/repomap.py b/aider/repomap.py
index 554286ad9..381a61d46 100644
--- a/aider/repomap.py
+++ b/aider/repomap.py
@@ -31,7 +31,6 @@ class RepoMap:
     cache_missing = False
 
     warned_files = set()
-    nx = None
 
     def __init__(
         self,