diff --git a/atrcopy/segments.py b/atrcopy/segments.py
index bd638a3..07d9090 100644
--- a/atrcopy/segments.py
+++ b/atrcopy/segments.py
@@ -57,7 +57,7 @@ class SegmentSaver(object):
     export_extensions = [".dat"]
     
     @classmethod
-    def encode_data(cls, segment):
+    def encode_data(cls, segment, ui_control):
         return segment.tostring()