Index: sys/ufs/ufs/dir.h
===================================================================
--- sys/ufs/ufs/dir.h
+++ sys/ufs/ufs/dir.h
@@ -110,7 +110,7 @@
  * 
  */
 #define	DIRECTSIZ(namlen)						\
-	(((uintptr_t)&((struct direct *)0)->d_name +			\
+	((offsetof(struct direct, d_name) +			\
 	  ((namlen)+1)*sizeof(((struct direct *)0)->d_name[0]) + 3) & ~3)
 #if (BYTE_ORDER == LITTLE_ENDIAN)
 #define	DIRSIZ(oldfmt, dp) \