diff --git a/aider/commands.py b/aider/commands.py
index a451df7b2..2536de205 100644
--- a/aider/commands.py
+++ b/aider/commands.py
@@ -231,12 +231,14 @@ class Commands:
 
         # If still no files, get all dirty files in the repo
         if not fnames and self.coder.repo:
-            fnames = [item.a_path for item in self.coder.repo.repo.index.diff(None)]
+            fnames = self.coder.repo.get_dirty_files()
 
         if not fnames:
             self.io.tool_error("No dirty files to lint.")
             return
 
+        fnames = [self.coder.abs_root_path(fname) for fname in fnames]
+
         lint_coder = None
         for fname in fnames:
             try: