diff --git a/scripts/filename_replace.py b/scripts/filename_replace.py
index 1e9e932..5a648a7 100644
--- a/scripts/filename_replace.py
+++ b/scripts/filename_replace.py
@@ -60,7 +60,7 @@ def get_replace_list(opt):
 def rename_files(opt):
     find_list = get_replace_list(opt)
 
-    for file in glob.glob(opt.img_dir + "/*"):
+    for idx, file in glob.iglob(opt.img_dir + "/*"):
         print(file)
 
         if os.path.splitext(file)[1] in (".jpg", ".png", ".jpeg", ".gif", ".bmp", ".webp"):
@@ -74,8 +74,9 @@ def rename_files(opt):
             try:
                 print(f"Renaming {file} to {new_filename}")
                 if os.path.exists(new_filename):
-                    print(f"filename already exists, cannot rename:{file} to {new_filename}")
-                else:
+                    new_filename = new_filename + "_" + idx
+                    print(f"filename already exists, appended '_n' to {new_filename}")
+
                     try:
                         os.rename(file, new_filename)
                     except Exception as e: