diff --git a/sys/net/bpf.h b/sys/net/bpf.h
index ffdc35696f4e..796e66c04067 100644
--- a/sys/net/bpf.h
+++ b/sys/net/bpf.h
@@ -1,4 +1,4 @@
-/*	$NetBSD: bpf.h,v 1.25 2000/01/31 23:06:12 thorpej Exp $	*/
+/*	$NetBSD: bpf.h,v 1.26 2000/11/02 16:14:05 eeh Exp $	*/
 
 /*
  * Copyright (c) 1990, 1991, 1993
@@ -161,8 +161,8 @@ struct bpf_hdr {
  */
 #ifdef _KERNEL
 #if defined(__arm32__) || defined(__i386__) || defined(__m68k__) || \
-    defined(__mips__) || defined(__ns32k__) || defined(__sparc__) || \
-    defined(__vax__) || defined(__sh3__)
+    defined(__mips__) || defined(__ns32k__) || defined(__vax__) || \
+    defined(__sh3__) || (defined(__sparc__) && !defined(__sparc64__))
 #define SIZEOF_BPF_HDR 18
 #else
 #define SIZEOF_BPF_HDR sizeof(struct bpf_hdr)