diff --git a/daemon/bencode.c b/daemon/bencode.c
index 9044d2a05..4b4eb12e5 100644
--- a/daemon/bencode.c
+++ b/daemon/bencode.c
@@ -327,6 +327,7 @@ static int __bencode_iovec_dump(struct iovec *out, bencode_item_t *item) {
 		out += __bencode_iovec_cpy(out, &item->iov[1], 1);
 
 	assert((out - orig) == item->iov_cnt);
+	(void) orig;
 	return item->iov_cnt;
 }
 
@@ -349,6 +350,7 @@ static int __bencode_str_dump(char *out, bencode_item_t *item) {
 		out += __bencode_str_cpy(out, &item->iov[1], 1);
 
 	assert((out - orig) == item->str_len);
+	(void) orig;
 	*out = '\0';
 	return item->str_len;
 }
diff --git a/daemon/control_ng.c b/daemon/control_ng.c
index 8a59decce..8d2ecd6a0 100644
--- a/daemon/control_ng.c
+++ b/daemon/control_ng.c
@@ -135,6 +135,7 @@ static void control_ng_incoming(struct obj *obj, str *buf, const endpoint_t *sin
 
 	int ret = bencode_buffer_init(&bencbuf);
 	assert(ret == 0);
+	(void) ret;
 	resp = bencode_dictionary(&bencbuf);
 	assert(resp != NULL);
 
diff --git a/include/dtls.h b/include/dtls.h
index 2733d1eac..cc820240d 100644
--- a/include/dtls.h
+++ b/include/dtls.h
@@ -83,6 +83,7 @@ INLINE void __dtls_hash(const struct dtls_hash_func *hash_func, X509 *cert, unsi
 	assert(bufsize >= hash_func->num_bytes);
 	n = hash_func->__func(out, cert);
 	assert(n == hash_func->num_bytes);
+	(void) n;
 }
 #define dtls_hash(hash_func, cert, outbuf) __dtls_hash(hash_func, cert, outbuf, sizeof(outbuf))
 
diff --git a/lib/auxlib.h b/lib/auxlib.h
index d433539d6..637464ab8 100644
--- a/lib/auxlib.h
+++ b/lib/auxlib.h
@@ -68,6 +68,7 @@ int uint32_eq(const void *a, const void *b);
 INLINE void random_string(unsigned char *buf, int len) {
 	int ret = RAND_bytes(buf, len);
 	assert(ret == 1);
+	(void) ret;
 }
 
 
diff --git a/lib/bitstr.h b/lib/bitstr.h
index ad530c5bd..6c0bb24a8 100644
--- a/lib/bitstr.h
+++ b/lib/bitstr.h
@@ -66,6 +66,7 @@ INLINE int bitstr_shift_ret(bitstr *b, unsigned int bits, str *ret) {
 	unsigned int int_bytes = b->bit_offset / 8;
 	int shift_ret = str_shift(&b->s, int_bytes);
 	assert(shift_ret == 0);
+	(void) shift_ret;
 	b->bit_offset -= int_bytes * 8;
 
 	return 0;