diff --git a/os/xdmcp.c b/os/xdmcp.c
index ce14a7069..83c8af62c 100644
--- a/os/xdmcp.c
+++ b/os/xdmcp.c
@@ -1518,7 +1518,7 @@ get_mcast_options(int argc, char **argv, int i)
         else {
             struct multicastinfo *mcastinfo, *mcl;
 
-            mcastinfo = malloc(sizeof(struct multicastinfo));
+            mcastinfo = XNFalloc(sizeof(struct multicastinfo));
             mcastinfo->next = NULL;
             mcastinfo->ai = firstai;
             mcastinfo->hops = hopcount;