diff --git a/xrdp/xrdp_mm.c b/xrdp/xrdp_mm.c
index 36252ec7..8da1d7b5 100644
--- a/xrdp/xrdp_mm.c
+++ b/xrdp/xrdp_mm.c
@@ -2226,7 +2226,7 @@ xrdp_mm_trans_process_drdynvc_channel_open(struct xrdp_mm *self,
     char name[1024 + 1];
     struct xrdp_drdynvc_procs procs;
 
-    if (!s_check_rem(s, 2))
+    if (!s_check_rem(s, 4))
     {
         return 1;
     }