diff --git a/grc/foo_pad_tagged_stream.block.yml b/grc/foo_pad_tagged_stream.block.yml
index 8012887..9226f67 100644
--- a/grc/foo_pad_tagged_stream.block.yml
+++ b/grc/foo_pad_tagged_stream.block.yml
@@ -15,6 +15,7 @@ parameters:
 - id: buffer_size
   label: Buffer Size
   dtype: int
+  default: '0x8000'
 - id: len_tag_name
   label: Length Tag Key
   dtype: string