diff --git a/labelImg.py b/labelImg.py
index 36a31e58..c6c8db80 100755
--- a/labelImg.py
+++ b/labelImg.py
@@ -791,6 +791,7 @@ class MainWindow(QMainWindow, WindowMixin):
                 if file.lower().endswith(tuple(extensions)):
                     relatviePath = os.path.join(root, file)
                     images.append(os.path.abspath(relatviePath))
+        images.sort(key=lambda x: x.lower())
         return images
 
     def changeSavedir(self, _value=False):