diff --git a/headers/posix/net/if_dl.h b/headers/posix/net/if_dl.h
index 9420e58d00..b6aab185f6 100644
--- a/headers/posix/net/if_dl.h
+++ b/headers/posix/net/if_dl.h
@@ -1,5 +1,5 @@
 /*
- * Copyright 2006, Haiku, Inc. All Rights Reserved.
+ * Copyright 2006-2007, Haiku, Inc. All Rights Reserved.
  * Distributed under the terms of the MIT License.
  */
 #ifndef _NET_IF_DL_H
@@ -19,10 +19,10 @@ struct sockaddr_dl {
 	uint8_t		sdl_nlen;		/* interface name length (not terminated with a null byte) */
 	uint8_t		sdl_alen;		/* link level address length */
 	uint8_t		sdl_slen;		/* link layer selector length */
-	char		sdl_data[20];	/* minimum work area, can be larger */
+	uint8_t		sdl_data[20];	/* minimum work area, can be larger */
 };
 
 /* Macro to get a pointer to the link level address */
-#define LLADDR(s)	((char *)((s)->sdl_data + (s)->sdl_nlen))
+#define LLADDR(s)	((uint8_t *)((s)->sdl_data + (s)->sdl_nlen))
 
 #endif	/* _NET_IF_DL_H */
diff --git a/src/add-ons/kernel/network/datalink_protocols/arp/arp.cpp b/src/add-ons/kernel/network/datalink_protocols/arp/arp.cpp
index f9fec41e49..7e0447532b 100644
--- a/src/add-ons/kernel/network/datalink_protocols/arp/arp.cpp
+++ b/src/add-ons/kernel/network/datalink_protocols/arp/arp.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright 2006, Haiku, Inc. All Rights Reserved.
+ * Copyright 2006-2007, Haiku, Inc. All Rights Reserved.
  * Distributed under the terms of the MIT License.
  *
  * Authors:
@@ -219,11 +219,13 @@ arp_update_entry(in_addr_t protocolAddress, sockaddr_dl *hardwareAddress,
 		// Right now, you have to manually purge the ARP entries (or wait some
 		// time) to let us switch to the new address.
 		if (entry->hardware_address.sdl_alen != 0 
-			&& memcmp(LLADDR(&entry->hardware_address), hardwareAddress, ETHER_ADDRESS_LENGTH)) {
+			&& memcmp(LLADDR(&entry->hardware_address),
+				LLADDR(hardwareAddress), ETHER_ADDRESS_LENGTH)) {
 			dprintf("ARP host %08lx updated with different hardware address %02x:%02x:%02x:%02x:%02x:%02x.\n",
-				protocolAddress, hardwareAddress->sdl_data[0] & 0xff, hardwareAddress->sdl_data[1] & 0xff,
-				hardwareAddress->sdl_data[2] & 0xff, hardwareAddress->sdl_data[3] & 0xff,
-				hardwareAddress->sdl_data[4] & 0xff, hardwareAddress->sdl_data[5] & 0xff);
+				protocolAddress,
+				hardwareAddress->sdl_data[0], hardwareAddress->sdl_data[1],
+				hardwareAddress->sdl_data[2], hardwareAddress->sdl_data[3],
+				hardwareAddress->sdl_data[4], hardwareAddress->sdl_data[5]);
 			return B_ERROR;
 		}