diff --git a/flit/flit.py b/flit/flit.py
index 80b5085..35a5d4a 100755
--- a/flit/flit.py
+++ b/flit/flit.py
@@ -222,7 +222,7 @@ def copy_files(cwd, new_name, files):
 
     """
     target = os.path.abspath(new_name)
-    for f in opts.files:
+    for f in files:
         print(f"Copying: {f}")
         source = os.path.join(cwd, f)
         if source.endswith("/"):