diff --git a/python/UTAT_HERON/qa_tagged_stream_fixed_length_padder.py b/python/UTAT_HERON/qa_tagged_stream_fixed_length_padder.py
index 218cb56..921974f 100755
--- a/python/UTAT_HERON/qa_tagged_stream_fixed_length_padder.py
+++ b/python/UTAT_HERON/qa_tagged_stream_fixed_length_padder.py
@@ -26,7 +26,7 @@ def tearDown(self):
         self.tb = None
 
     def test_instance(self):
-        instance = tagged_stream_fixed_length_padder('packet_len', 1, 10, 0x00)
+        instance = tagged_stream_fixed_length_padder('packet_len', 1, 10, 0x00, 5)
 
     def test_001_descriptive_test_name(self):
         # set up fg