diff --git a/rtlplayground.c b/rtlplayground.c
index 700df0b8..6d88e145 100644
--- a/rtlplayground.c
+++ b/rtlplayground.c
@@ -1252,7 +1252,7 @@ void handle_rx(void)
 			}
 		} else if (ETH_IN->ether_type == HTONS(0x0800)) { // IPv4
 			if (!management_vlan || management_vlan == rx_packet_vlan) {
-				uip_arp_ipin();	// Learn MAC addresses in TCP packets
+				uip_arp_ipin();
 				uip_input();
 				if (uip_len) {
 					// Add ethernet frame
diff --git a/uip/uip_arp.c b/uip/uip_arp.c
index 44bee6c4..42d48213 100644
--- a/uip/uip_arp.c
+++ b/uip/uip_arp.c
@@ -239,12 +239,9 @@ uip_arp_update(__xdata u16_t * __xdata ipaddr, __xdata struct uip_eth_addr * __x
  * variable uip_len.
  */
 /*-----------------------------------------------------------------------------------*/
-#if 0
 void
-uip_arp_ipin(void)
+uip_arp_ipin(void) __banked
 {
-  uip_len -= sizeof(struct uip_eth_hdr);
-	
   /* Only insert/update an entry if the source IP address of the
      incoming IP packet comes from a host on the local network. */
   if((IPBUF->srcipaddr[0] & uip_netmask[0]) !=
@@ -259,7 +256,6 @@ uip_arp_ipin(void)
   
   return;
 }
-#endif /* 0 */
 /*-----------------------------------------------------------------------------------*/
 /**
  * ARP processing for incoming ARP packets.
diff --git a/uip/uip_arp.h b/uip/uip_arp.h
index 833d7c22..57930979 100644
--- a/uip/uip_arp.h
+++ b/uip/uip_arp.h
@@ -78,8 +78,7 @@ void uip_arp_init(void) __banked;
    inserts a new mapping if none exists. The function assumes that an
    IP packet with an Ethernet header is present in the uip_buf buffer
    and that the length of the packet is in the uip_len variable. */
-/*void uip_arp_ipin(void);*/
-#define uip_arp_ipin()
+void uip_arp_ipin(void) __banked;
 
 /* The uip_arp_arpin() should be called when an ARP packet is received
    by the Ethernet driver. This function also assumes that the