diff --git a/preprocessing.py b/preprocessing.py
index afccaeb..4fd3010 100644
--- a/preprocessing.py
+++ b/preprocessing.py
@@ -158,6 +158,20 @@ def check_labels():
                         print('Error!')
 
 
+def fix_class(folder):
+    for label in os.listdir(folder):
+        if label.startswith('0000'):
+            with open(os.path.join(folder, label), 'r+') as f:
+                lines = f.readlines()
+                for i in range(0, len(lines)):
+                    l = lines[i]
+                    lines[i] = f'2{l[1:]}'
+                f.seek(0)  # rewind
+                f.writelines(lines)
+
+
 if __name__ == '__main__':
-    check_labels()
+    fix_class('datasets/zombobase-2024-06-18/test/labels')
+    fix_class('datasets/zombobase-2024-06-18/train/labels')
+    fix_class('datasets/zombobase-2024-06-18/valid/labels')
     # main()