diff --git a/gr-digital/grc/digital_protocol_formatter_bb.block.yml b/gr-digital/grc/digital_protocol_formatter_bb.block.yml
index bae1663909a..995a1a527cf 100644
--- a/gr-digital/grc/digital_protocol_formatter_bb.block.yml
+++ b/gr-digital/grc/digital_protocol_formatter_bb.block.yml
@@ -30,5 +30,7 @@ cpp_templates:
     declarations: 'digital::protocol_formatter_bb::sptr ${id};'
     make: 'this->${id} = digital::protocol_formatter_bb::make(${format}, ${len_tag_key});'
     link: ['gnuradio::gnuradio-digital']
+    callbacks:
+    - set_header_format(${format})
 
 file_format: 1