diff --git a/labelImg.py b/labelImg.py
index efd8a2976..9277ce20f 100755
--- a/labelImg.py
+++ b/labelImg.py
@@ -109,6 +109,7 @@ def __init__(self, default_filename=None, default_prefdef_class_file=None, defau
 
         # Load predefined classes to the list
         self.load_predefined_classes(default_prefdef_class_file)
+        self.default_prefdef_class_file = default_prefdef_class_file
 
         if self.label_hist:
             self.default_label = self.label_hist[0]
@@ -1636,7 +1637,7 @@ def load_yolo_txt_by_filename(self, txt_path):
             return
 
         self.set_format(FORMAT_YOLO)
-        t_yolo_parse_reader = YoloReader(txt_path, self.image)
+        t_yolo_parse_reader = YoloReader(txt_path, self.image, self.default_prefdef_class_file)
         shapes = t_yolo_parse_reader.get_shapes()
         print(shapes)
         self.load_labels(shapes)