diff --git a/bin/varnishd/cache/cache_gzip.c b/bin/varnishd/cache/cache_gzip.c
index e7fab9fac1..7e3d245cd9 100644
--- a/bin/varnishd/cache/cache_gzip.c
+++ b/bin/varnishd/cache/cache_gzip.c
@@ -417,12 +417,9 @@ vdp_gunzip_bytes(struct vdp_ctx *vdc, enum vdp_action act, void **priv,
 	enum vgzret_e vr;
 	ssize_t dl;
 	const void *dp;
-	struct worker *wrk;
 	struct vgz *vg;
 
 	CHECK_OBJ_NOTNULL(vdc, VDP_CTX_MAGIC);
-	wrk = vdc->wrk;
-	CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);
 	(void)act;
 
 	CAST_OBJ_NOTNULL(vg, *priv, VGZ_MAGIC);
diff --git a/bin/varnishd/cache/cache_hash.c b/bin/varnishd/cache/cache_hash.c
index 23303a60e7..92f8563b3d 100644
--- a/bin/varnishd/cache/cache_hash.c
+++ b/bin/varnishd/cache/cache_hash.c
@@ -400,7 +400,6 @@ hsh_vry_match(const struct req *req, struct objcore *oc, const uint8_t *vary)
 static unsigned
 hsh_rush_match(const struct req *req)
 {
-	struct objhead *oh;
 	struct objcore *oc;
 
 	oc = req->objcore;
@@ -416,9 +415,6 @@ hsh_rush_match(const struct req *req)
 	if (req->vcf != NULL) /* NB: must operate under oh lock. */
 		return (0);
 
-	oh = oc->objhead;
-	CHECK_OBJ_NOTNULL(oh, OBJHEAD_MAGIC);
-
 	return (hsh_vry_match(req, oc, NULL));
 }
 
diff --git a/bin/varnishd/cache/cache_session.c b/bin/varnishd/cache/cache_session.c
index c031cb665f..de786162b5 100644
--- a/bin/varnishd/cache/cache_session.c
+++ b/bin/varnishd/cache/cache_session.c
@@ -675,11 +675,8 @@ void
 SES_Rel(struct sess *sp)
 {
 	int i;
-	struct pool *pp;
 
 	CHECK_OBJ_NOTNULL(sp, SESS_MAGIC);
-	pp = sp->pool;
-	CHECK_OBJ_NOTNULL(pp, POOL_MAGIC);
 
 	Lck_Lock(&sp->mtx);
 	assert(sp->refcnt > 0);
diff --git a/bin/varnishd/http2/cache_http2_deliver.c b/bin/varnishd/http2/cache_http2_deliver.c
index 4013012436..e7ef43fdde 100644
--- a/bin/varnishd/http2/cache_http2_deliver.c
+++ b/bin/varnishd/http2/cache_http2_deliver.c
@@ -297,7 +297,6 @@ h2_deliver(struct req *req, int sendbody)
 {
 	size_t sz;
 	const char *r;
-	struct sess *sp;
 	struct h2_req *r2;
 	struct vsb resp[1];
 	struct vrt_ctx ctx[1];
@@ -306,8 +305,6 @@ h2_deliver(struct req *req, int sendbody)
 	CHECK_OBJ_NOTNULL(req, REQ_MAGIC);
 	CHECK_OBJ_NOTNULL(req->objcore, OBJCORE_MAGIC);
 	CAST_OBJ_NOTNULL(r2, req->transport_priv, H2_REQ_MAGIC);
-	sp = req->sp;
-	CHECK_OBJ_NOTNULL(sp, SESS_MAGIC);
 
 	VSLb(req->vsl, SLT_RespProtocol, "HTTP/2.0");
 
diff --git a/include/miniobj.h b/include/miniobj.h
index dd6f0ca9d2..c986eb8117 100644
--- a/include/miniobj.h
+++ b/include/miniobj.h
@@ -57,6 +57,7 @@
 #define VALID_OBJ(ptr, type_magic)					\
 	((ptr) != NULL && (ptr)->magic == (type_magic))
 
+#ifndef NO_CHECK_OBJ
 #define CHECK_OBJ(ptr, type_magic)					\
 	do {								\
 		assert((ptr)->magic == type_magic);			\
@@ -73,6 +74,11 @@
 		if ((ptr) != NULL)					\
 			assert((ptr)->magic == type_magic);		\
 	} while (0)
+#else
+#define CHECK_OBJ(ptr, type_magic) (void)0
+#define CHECK_OBJ_NOTNULL(ptr, type_magic) (void)0
+#define CHECK_OBJ_ORNULL(ptr, type_magic) (void)0
+#endif
 
 #define CAST_OBJ(to, from, type_magic)					\
 	do {								\
diff --git a/vmod/vmod_directors.c b/vmod/vmod_directors.c
index 44b98217fe..eed7f60966 100644
--- a/vmod/vmod_directors.c
+++ b/vmod/vmod_directors.c
@@ -343,7 +343,7 @@ vdir_update_health(VRT_CTX, struct vdir *vd)
 		be = vd->backend[u];
 		CHECK_OBJ_NOTNULL(be, DIRECTOR_MAGIC);
 		c = 0;
-		h = VRT_Healthy(ctx, vd->backend[u], &c);
+		h = VRT_Healthy(ctx, be, &c);
 		if (h) {
 			nh++;
 			tw += vd->weight[u];