diff --git a/libfreerdp/core/gcc.c b/libfreerdp/core/gcc.c
index d9c6fe67a..957946fb1 100644
--- a/libfreerdp/core/gcc.c
+++ b/libfreerdp/core/gcc.c
@@ -288,7 +288,7 @@ void gcc_write_conference_create_response(wStream* s, wStream* userData)
 	per_write_object_identifier(s, t124_02_98_oid);
 
 	/* ConnectData::connectPDU (OCTET_STRING) */
-	per_write_length(s, Stream_GetPosition(userData) + 2);
+	per_write_length(s, 0x2A);
 
 	/* ConnectGCCPDU */
 	per_write_choice(s, 0x14);