diff --git a/examples/bmmo.bp b/examples/bmmo.bp
index b16bcf2..8f4c3fd 100644
--- a/examples/bmmo.bp
+++ b/examples/bmmo.bp
@@ -25,13 +25,10 @@ natural reliable msg player_disconnected_msg {
     gnsid connection_id;
 }
 
-narrow struct chat_body {
+narrow reliable msg chat_msg {
     gnsid player_id;
     string chat_content;
 }
-narrow reliable msg chat_msg {
-    chat_body data;
-}
 
 // ============= v3.1 anti-cheat update chapter
 
diff --git a/snippets/functions.py b/snippets/functions.py
index 1ebc0f2..59abd27 100644
--- a/snippets/functions.py
+++ b/snippets/functions.py
@@ -28,7 +28,7 @@ def ReadOpCode(_ss: io.BytesIO) -> OpCode:
 	return _opcode
 def PeekOpCode(_ss: io.BytesIO) -> OpCode:
 	(_opcode, ) = _opcode_packer.unpack(_ss.read(_opcode_packer.size))
-	_ss.seek(_opcode_packer.size, os.SEEK_CUR)
+	_ss.seek(-(_opcode_packer.size), os.SEEK_CUR)
 	return _opcode
 def WriteOpCode(_opcode: OpCode, _ss: io.BytesIO):
 	_ss.write(_opcode_packer.pack(_opcode))