diff --git a/channels/disp/server/disp_main.c b/channels/disp/server/disp_main.c
index 0c6f4afae..a681e27e7 100644
--- a/channels/disp/server/disp_main.c
+++ b/channels/disp/server/disp_main.c
@@ -58,7 +58,7 @@ static wStream* disp_server_single_packet_new(UINT32 type, UINT32 length)
 	}
 
 	header.type = type;
-	header.length = length;
+	header.length = DISPLAY_CONTROL_HEADER_LENGTH + length;
 
 	if ((error = disp_write_header(s, &header)))
 	{