diff --git a/sys/netinet6/esp_core.c b/sys/netinet6/esp_core.c
index 60844eb0bd66..88267bf470b2 100644
--- a/sys/netinet6/esp_core.c
+++ b/sys/netinet6/esp_core.c
@@ -1,5 +1,5 @@
-/*	$NetBSD: esp_core.c,v 1.13 2000/11/02 12:25:01 itojun Exp $	*/
-/*	$KAME: esp_core.c,v 1.49 2000/11/02 12:21:20 itojun Exp $	*/
+/*	$NetBSD: esp_core.c,v 1.14 2000/11/02 12:28:45 itojun Exp $	*/
+/*	$KAME: esp_core.c,v 1.50 2000/11/02 12:27:38 itojun Exp $	*/
 
 /*
  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
@@ -350,7 +350,8 @@ esp_des_blockdecrypt(algo, sav, s, d)
 {
 
 	/* assumption: d has a good alignment */
-	des_ecb_encrypt((des_cblock *)s, (des_cblock *)d,
+	bcopy(s, d, sizeof(DES_LONG) * 2);
+	des_ecb_encrypt((des_cblock *)d, (des_cblock *)d,
 	    *(des_key_schedule *)sav->sched, DES_DECRYPT);
 	return 0;
 }
@@ -364,9 +365,9 @@ esp_des_blockencrypt(algo, sav, s, d)
 {
 
 	/* assumption: d has a good alignment */
-	des_ecb_encrypt((des_cblock *)s, (des_cblock *)d,
-	    *(des_key_schedule *)sav->sched,
-	    DES_ENCRYPT);
+	bcopy(s, d, sizeof(DES_LONG) * 2);
+	des_ecb_encrypt((des_cblock *)d, (des_cblock *)d,
+	    *(des_key_schedule *)sav->sched, DES_ENCRYPT);
 	return 0;
 }