diff --git a/labelme/app.py b/labelme/app.py
index 4182770f4..1dae25c53 100644
--- a/labelme/app.py
+++ b/labelme/app.py
@@ -2143,7 +2143,7 @@ def scanAllImages(self, folderPath):
         for root, dirs, files in os.walk(folderPath):
             for file in files:
                 if file.lower().endswith(tuple(extensions)):
-                    relativePath = osp.join(root, file)
+                    relativePath = os.path.normpath(osp.join(root, file))
                     images.append(relativePath)
         images = natsort.os_sorted(images)
         return images