diff --git a/usr.bin/xlint/lint1/decl.c b/usr.bin/xlint/lint1/decl.c
index 08a0d1a2c8ee..25313c0e7297 100644
--- a/usr.bin/xlint/lint1/decl.c
+++ b/usr.bin/xlint/lint1/decl.c
@@ -1,4 +1,4 @@
-/* $NetBSD: decl.c,v 1.50 2009/10/02 21:04:03 christos Exp $ */
+/* $NetBSD: decl.c,v 1.51 2009/10/02 21:49:30 christos Exp $ */
 
 /*
  * Copyright (c) 1996 Christopher G. Demetriou.  All Rights Reserved.
@@ -38,7 +38,7 @@
 
 #include <sys/cdefs.h>
 #if defined(__RCSID) && !defined(lint)
-__RCSID("$NetBSD: decl.c,v 1.50 2009/10/02 21:04:03 christos Exp $");
+__RCSID("$NetBSD: decl.c,v 1.51 2009/10/02 21:49:30 christos Exp $");
 #endif
 
 #include <sys/param.h>
@@ -495,19 +495,26 @@ setpackedsize(type_t *tp)
 
 	switch (tp->t_tspec) {
 	case STRUCT:
-		sp = tp->t_str;
-		sp->size = 0;
-		for (mem = sp->memb; mem != NULL; mem = mem->s_nxt) {
-			size_t x = (size_t)tsize(mem->s_type);
-			sp->size += x;
-		}
-		break;
 	case UNION:
 		sp = tp->t_str;
 		sp->size = 0;
 		for (mem = sp->memb; mem != NULL; mem = mem->s_nxt) {
+			if (mem->s_type->t_isfield) {
+				size_t len = mem->s_type->t_flen;
+				while (mem && mem->s_type->t_isfield) {
+					len += mem->s_type->t_flen;
+					mem = mem->s_nxt;
+				}
+				len = ((len + INT_SIZE - 1) /
+				    INT_SIZE) * INT_SIZE;
+				sp->size += len;
+				if (mem == NULL)
+					break;
+			}
 			size_t x = (size_t)tsize(mem->s_type);
-			if (x > sp->size)
+			if (tp->t_tspec == STRUCT)
+				sp->size += x;
+			else if (x > sp->size)
 				sp->size = x;
 		}
 		break;