diff --git a/source3/smbd/nttrans.c b/source3/smbd/nttrans.c
index f82820c..d5d4941 100644
--- a/source3/smbd/nttrans.c
+++ b/source3/smbd/nttrans.c
@@ -858,6 +858,10 @@ static NTSTATUS set_sd(files_struct *fsp, uint8 *data, uint32 sd_len,
 		security_info_sent &= ~GROUP_SECURITY_INFORMATION;
 	}
 
+	if (security_info_sent & 0x10) {
+		return NT_STATUS_ACCESS_DENIED;
+	}
+
 	/* Ensure we have at least one thing set. */
 	if ((security_info_sent & (SECINFO_OWNER|SECINFO_GROUP|SECINFO_DACL|SECINFO_SACL)) == 0) {
 		return NT_STATUS_INVALID_PARAMETER;