diff --git a/src/radv.c b/src/radv.c
index 749b666..faa0f6d 100644
--- a/src/radv.c
+++ b/src/radv.c
@@ -262,7 +262,9 @@ static void send_ra_alias(time_t now, int iface, char *iface_name, struct in6_ad
   parm.prio = calc_prio(ra_param);
   
   save_counter(0);
-  ra = expand(sizeof(struct ra_packet));
+  
+  if (!(ra = expand(sizeof(struct ra_packet))))
+    return;
   
   ra->type = ND_ROUTER_ADVERT;
   ra->code = 0;
diff --git a/src/slaac.c b/src/slaac.c
index 8034805..07b8ba4 100644
--- a/src/slaac.c
+++ b/src/slaac.c
@@ -147,7 +147,10 @@ time_t periodic_slaac(time_t now, struct dhcp_lease *leases)
 	    struct sockaddr_in6 addr;
  
 	    save_counter(0);
-	    ping = expand(sizeof(struct ping_packet));
+
+	    if (!(ping = expand(sizeof(struct ping_packet))))
+	      continue;
+
 	    ping->type = ICMP6_ECHO_REQUEST;
 	    ping->code = 0;
 	    ping->identifier = ping_id;