diff --git a/net/tftp.c b/net/tftp.c
index 5a5ae22..64a5576 100644
--- a/net/tftp.c
+++ b/net/tftp.c
@@ -302,13 +302,11 @@
 TftpStart (void)
 {
 	if (BootFile[0] == '\0') {
-		IPaddr_t OurIP = ntohl(NetOurIP);
-
 		sprintf(default_filename, "%02lX%02lX%02lX%02lX.img",
-			OurIP & 0xFF,
-			(OurIP >>  8) & 0xFF,
-			(OurIP >> 16) & 0xFF,
-			(OurIP >> 24) & 0xFF	);
+			NetOurIP & 0xFF,
+			(NetOurIP >>  8) & 0xFF,
+			(NetOurIP >> 16) & 0xFF,
+			(NetOurIP >> 24) & 0xFF	);
 		tftp_filename = default_filename;
 
 		printf ("*** Warning: no boot file name; using '%s'\n",