diff --git a/src/mux_fcgi.c b/src/mux_fcgi.c
index f49b66f7d..8838be95d 100644
--- a/src/mux_fcgi.c
+++ b/src/mux_fcgi.c
@@ -981,7 +981,7 @@ static inline void fcgi_strm_propagate_term_flags(struct fcgi_conn *fconn, struc
  */
 static void fcgi_strm_destroy(struct fcgi_strm *fstrm)
 {
-	struct connection *conn = fstrm->fconn->conn;
+	struct connection __maybe_unused *conn = fstrm->fconn->conn;
 
 	TRACE_ENTER(FCGI_EV_FSTRM_END, conn, fstrm);
 
@@ -3540,7 +3540,7 @@ static size_t fcgi_strm_parse_trailers(struct fcgi_strm *fstrm, struct h1m *h1m,
 
 static size_t fcgi_strm_parse_response(struct fcgi_strm *fstrm, struct buffer *buf, size_t count)
 {
-	struct fcgi_conn *fconn = fstrm->fconn;
+	struct fcgi_conn __maybe_unused *fconn = fstrm->fconn;
 	struct htx *htx;
 	struct h1m *h1m = &fstrm->h1m;
 	size_t ret, data, total = 0;
@@ -4031,7 +4031,7 @@ static int fcgi_subscribe(struct stconn *sc, int event_type, struct wait_event *
 static int fcgi_unsubscribe(struct stconn *sc, int event_type, struct wait_event *es)
 {
 	struct fcgi_strm *fstrm = __sc_mux_strm(sc);
-	struct fcgi_conn *fconn = fstrm->fconn;
+	struct fcgi_conn __maybe_unused *fconn = fstrm->fconn;
 
 	BUG_ON(event_type & ~(SUB_RETRY_SEND|SUB_RETRY_RECV));
 	BUG_ON(fstrm->subs && fstrm->subs != es);
diff --git a/src/mux_h1.c b/src/mux_h1.c
index 3c726d7fd..ec97d020d 100644
--- a/src/mux_h1.c
+++ b/src/mux_h1.c
@@ -1897,7 +1897,7 @@ static void h1_append_chunk_crlf(struct buffer *buf)
  */
 static void h1_set_tunnel_mode(struct h1s *h1s)
 {
-	struct h1c *h1c = h1s->h1c;
+	struct h1c __maybe_unused *h1c = h1s->h1c;
 
 	h1s->req.state = H1_MSG_TUNNEL;
 	h1s->req.flags &= ~(H1_MF_XFER_LEN|H1_MF_CLEN|H1_MF_CHNK);
diff --git a/src/mux_h2.c b/src/mux_h2.c
index 37162fc3c..8a54e3a0c 100644
--- a/src/mux_h2.c
+++ b/src/mux_h2.c
@@ -1281,7 +1281,7 @@ void _h2_trace_header(const struct ist hn, const struct ist hv,
 		      const struct h2c *h2c, const struct h2s *h2s)
 {
 	struct ist n_ist, v_ist;
-	const char *c_str, *s_str;
+	const char __maybe_unused *c_str, *s_str;
 
 	chunk_reset(&trash);
 	c_str = chunk_newstr(&trash);
@@ -2024,7 +2024,7 @@ static inline void h2s_propagate_term_flags(struct h2c *h2c, struct h2s *h2s)
  */
 static void h2s_destroy(struct h2s *h2s)
 {
-	struct connection *conn = h2s->h2c->conn;
+	struct connection __maybe_unused *conn = h2s->h2c->conn;
 	int freed = 0;
 
 	TRACE_ENTER(H2_EV_H2S_END, conn, h2s);
@@ -7613,7 +7613,7 @@ static size_t h2s_make_data(struct h2s *h2s, struct buffer *buf, size_t count)
  */
 static size_t h2s_skip_data(struct h2s *h2s, struct buffer *buf, size_t count)
 {
-	struct h2c *h2c = h2s->h2c;
+	struct h2c __maybe_unused *h2c = h2s->h2c;
 	struct htx *htx;
 	int bsize; /* htx block size */
 	int fsize; /* h2 frame size  */
diff --git a/src/mux_spop.c b/src/mux_spop.c
index 8fd08e29c..c3ca4ac7d 100644
--- a/src/mux_spop.c
+++ b/src/mux_spop.c
@@ -1154,7 +1154,7 @@ static inline void spop_strm_propagate_term_flags(struct spop_conn *spop_conn, s
  */
 static void spop_strm_destroy(struct spop_strm *spop_strm)
 {
-	struct connection *conn = spop_strm->spop_conn->conn;
+	struct connection __maybe_unused *conn = spop_strm->spop_conn->conn;
 
 	TRACE_ENTER(SPOP_EV_SPOP_STRM_END, conn, spop_strm);
 
@@ -3199,7 +3199,7 @@ static int spop_subscribe(struct stconn *sc, int event_type, struct wait_event *
 static int spop_unsubscribe(struct stconn *sc, int event_type, struct wait_event *es)
 {
 	struct spop_strm *spop_strm = __sc_mux_strm(sc);
-	struct spop_conn *spop_conn = spop_strm->spop_conn;
+	struct spop_conn __maybe_unused *spop_conn = spop_strm->spop_conn;
 
 	BUG_ON(event_type & ~(SUB_RETRY_SEND|SUB_RETRY_RECV));
 	BUG_ON(spop_strm->subs && spop_strm->subs != es);
diff --git a/src/quic_ssl.c b/src/quic_ssl.c
index f3f0d9afd..18dc9650c 100644
--- a/src/quic_ssl.c
+++ b/src/quic_ssl.c
@@ -710,7 +710,7 @@ static inline int ha_quic_set_write_secret(SSL *ssl, enum ssl_encryption_level_t
 
 static int ha_quic_flush_flight(SSL *ssl)
 {
-	struct quic_conn *qc = SSL_get_ex_data(ssl, ssl_qc_app_data_index);
+	struct quic_conn __maybe_unused *qc = SSL_get_ex_data(ssl, ssl_qc_app_data_index);
 
 	TRACE_ENTER(QUIC_EV_CONN_FFLIGHT, qc);
 	TRACE_LEAVE(QUIC_EV_CONN_FFLIGHT, qc);
diff --git a/src/quic_tls.c b/src/quic_tls.c
index 55d36e662..04d6b6b88 100644
--- a/src/quic_tls.c
+++ b/src/quic_tls.c
@@ -1060,7 +1060,7 @@ int quic_tls_key_update(struct quic_conn *qc)
 	struct quic_tls_secrets *rx = &tls_ctx->rx;
 	struct quic_tls_secrets *tx = &tls_ctx->tx;
 	/* Used only for the traces */
-	struct quic_kp_trace kp_trace = {
+	struct quic_kp_trace __maybe_unused kp_trace = {
 		.rx_sec = rx->secret,
 		.rx_seclen = rx->secretlen,
 		.tx_sec = tx->secret,
diff --git a/src/ssl_clienthello.c b/src/ssl_clienthello.c
index 3a7775444..7d769611b 100644
--- a/src/ssl_clienthello.c
+++ b/src/ssl_clienthello.c
@@ -349,7 +349,7 @@ int ssl_sock_switchctx_cbk(SSL *ssl, int *al, void *arg)
 	if ((TRACE_SOURCE)->verbosity >= SSL_VERB_ADVANCED) {
 		if (TRACE_ENABLED(TRACE_LEVEL_DATA, SSL_EV_CONN_CIPHERS_EXT, conn, 0, 0, 0)) {
 			const uint8_t *cipher_suites;
-			size_t len;
+			size_t __maybe_unused len;
 
 #if defined(OPENSSL_IS_BORINGSSL) || defined(OPENSSL_IS_AWSLC)
 			len = ctx->cipher_suites_len;