diff --git a/include/ntfs-3g/security.h b/include/ntfs-3g/security.h
index d28bc89b..b5c6375e 100644
--- a/include/ntfs-3g/security.h
+++ b/include/ntfs-3g/security.h
@@ -173,7 +173,7 @@ struct POSIX_SECURITY {
 	int defcnt;
 	int firstdef;
 	u16 tagsset;
-	s32 alignment[0];
+	u16 filler;
 	struct POSIX_ACL acl;
 } ;