diff --git a/sys/kern/vfs_cache.c b/sys/kern/vfs_cache.c
index c47f6a0438b..9964c0c6c3e 100644
--- a/sys/kern/vfs_cache.c
+++ b/sys/kern/vfs_cache.c
@@ -5084,7 +5084,9 @@ cache_fplookup_dotdot(struct cache_fpl *fpl)
 static int __noinline
 cache_fplookup_neg(struct cache_fpl *fpl, struct namecache *ncp, uint32_t hash)
 {
-	u_char nc_flag __diagused;
+#ifdef INVARIANTS
+	u_char nc_flag;
+#endif
 	bool neg_promote;
 
 #ifdef INVARIANTS
diff --git a/sys/kern/vfs_default.c b/sys/kern/vfs_default.c
index 6f304f0f719..8256f16add0 100644
--- a/sys/kern/vfs_default.c
+++ b/sys/kern/vfs_default.c
@@ -1379,7 +1379,9 @@ static int __always_inline
 vop_stdadd_writecount_impl(struct vop_add_writecount_args *ap, bool handle_msync)
 {
 	struct vnode *vp;
-	struct mount *mp __diagused;
+#ifdef INVARIANTS
+	struct mount *mp;
+#endif
 	int n;
 
 	vp = ap->a_vp;