diff --git a/src/core/tcp.c b/src/core/tcp.c
index 773bb543..0258f509 100644
--- a/src/core/tcp.c
+++ b/src/core/tcp.c
@@ -719,7 +719,7 @@ tcp_seg_copy(struct tcp_seg *seg)
     return NULL;
   }
   memcpy((char *)cseg, (const char *)seg, sizeof(struct tcp_seg)); 
-  pbuf_ref_chain(cseg->p);
+  pbuf_ref(cseg->p);
   return cseg;
 }
 /*-----------------------------------------------------------------------------------*/
diff --git a/src/netif/etharp.c b/src/netif/etharp.c
index 6565ab2e..a0f05996 100644
--- a/src/netif/etharp.c
+++ b/src/netif/etharp.c
@@ -687,7 +687,7 @@ struct pbuf *etharp_query(struct netif *netif, struct ip_addr *ipaddr, struct pb
     /* copy PBUF_REF referenced payloads to PBUF_RAM */
     q = pbuf_take(q);
     /* pbufs are queued, increase the reference count */
-    pbuf_ref_chain(q);
+    pbuf_ref(q);
     /* remember pbuf to queue, if any */
     arp_table[i].p = q;
     DEBUGF(ETHARP_DEBUG | DBG_TRACE | DBG_STATE, ("etharp_query: queued packet %p on ARP entry %u.\n", (void *)q, i));