diff --git a/net/bootp.c b/net/bootp.c
index 1a717867d48885b479050909b43d1cba0b372fe7..87b027e8fa65b03e126992a3a44971e7842c24ba 100644
--- a/net/bootp.c
+++ b/net/bootp.c
@@ -464,7 +464,7 @@ static int DhcpExtended (u8 * e, int message_type, IPaddr_t ServerID, IPaddr_t R
 
 	/* Pad to minimal length */
 #ifdef	CONFIG_DHCP_MIN_EXT_LEN
-	while ((e - start) <= CONFIG_DHCP_MIN_EXT_LEN)
+	while ((e - start) < CONFIG_DHCP_MIN_EXT_LEN)
 		*e++ = 0;
 #endif