diff --git a/drivers/net/Makefile b/drivers/net/Makefile
index a52d53fa..0c5c9997 100644
--- a/drivers/net/Makefile
+++ b/drivers/net/Makefile
@@ -1,4 +1,4 @@
-C_source := rtl8139.c rckemac.c mmnif.c
+C_source := rtl8139.c rckemac.c mmnif.c util.c
 MODULE := drivers_net
 
 include $(TOPDIR)/Makefile.inc
diff --git a/drivers/net/mmnif.c b/drivers/net/mmnif.c
index ebfb06ef..926f9a47 100644
--- a/drivers/net/mmnif.c
+++ b/drivers/net/mmnif.c
@@ -762,7 +762,7 @@ err_t mmnif_tx(struct netif* netif, struct pbuf* p)
 
 #ifdef DEBUG_MMNIF
 	DEBUGPRINTF("\n SEND 0x%.8X\n",(char*)mmnif->rx_buff + 2 + pos * 1792);
-//	hex_dump(p->tot_len +2, mmnif->tx_buff[slot]);
+	hex_dump(p->tot_len +2, mmnif->tx_buff[slot]);
 #endif
 
 	/* if driver is not in polling mode inform core that a message has arrived */
@@ -972,7 +972,7 @@ static void mmnif_rx(struct netif* netif)
 
 #ifdef DEBUG_MMNIF
 	DEBUGPRINTF("\n RECIEVED - 0x%.8X\n",data + pos);
-//	hex_dump(length+2,data + pos);
+	hex_dump(length+2,data + pos);
 #endif
 	
 	/* drop the length word of the packet data since it's no longer needed*/
diff --git a/drivers/net/util.c b/drivers/net/util.c
index 817b30b7..f925ba52 100644
--- a/drivers/net/util.c
+++ b/drivers/net/util.c
@@ -8,22 +8,22 @@ void hex_dump(unsigned n, const unsigned char* buf)
 int on_this_line = 0;
 	while (n-- > 0) 
 	{
-		fprintf(stderr, "%02X ", *buf++);
+		kprintf("%02X ", *buf++);
 		on_this_line += 1;
 		if (on_this_line == 16 || n == 0) 
 		{
 			int i;
 			
-			fputs(" ", stderr);
+			kputs(" ");
 
 			for (i = on_this_line; i < 16; i++)
-				fputs(" ", stderr);
+				kputs(" ");
 			
 			for (i = on_this_line; i > 0; i--)
-				fputc(isprint(buf[-i]) ? buf[-i] : '.', stderr);
+				kputc(isprint(buf[-i]) ? buf[-i] : '.');
 			
-			fputs("\n", stderr);
+			kputs("\n");
 			on_this_line = 0;
 		}
 	}
-}
\ No newline at end of file
+}