diff --git a/include/haproxy/quic_conn-t.h b/include/haproxy/quic_conn-t.h
index 98434416d..a4c294be1 100644
--- a/include/haproxy/quic_conn-t.h
+++ b/include/haproxy/quic_conn-t.h
@@ -448,7 +448,7 @@ struct quic_conn_closed {
 #define QUIC_FL_CONN_ANTI_AMPLIFICATION_REACHED  (1U << 0)
 #define QUIC_FL_CONN_SPIN_BIT                    (1U << 1) /* Spin bit set by remote peer */
 #define QUIC_FL_CONN_NEED_POST_HANDSHAKE_FRMS    (1U << 2) /* HANDSHAKE_DONE must be sent */
-/* gap here */
+#define QUIC_FL_CONN_IS_BACK                     (1U << 3) /* conn used on backend side */
 #define QUIC_FL_CONN_ACCEPT_REGISTERED           (1U << 4)
 #define QUIC_FL_CONN_UDP_GSO_EIO                 (1U << 5) /* GSO disabled due to a EIO occured on same listener */
 #define QUIC_FL_CONN_IDLE_TIMER_RESTARTED_AFTER_READ (1U << 6)
@@ -488,6 +488,7 @@ static forceinline char *qc_show_flags(char *buf, size_t len, const char *delim,
 	_(QUIC_FL_CONN_ANTI_AMPLIFICATION_REACHED,
 	_(QUIC_FL_CONN_SPIN_BIT,
 	_(QUIC_FL_CONN_NEED_POST_HANDSHAKE_FRMS,
+	_(QUIC_FL_CONN_IS_BACK,
 	_(QUIC_FL_CONN_ACCEPT_REGISTERED,
 	_(QUIC_FL_CONN_UDP_GSO_EIO,
 	_(QUIC_FL_CONN_IDLE_TIMER_RESTARTED_AFTER_READ,
@@ -508,7 +509,7 @@ static forceinline char *qc_show_flags(char *buf, size_t len, const char *delim,
 	_(QUIC_FL_CONN_EXP_TIMER,
 	_(QUIC_FL_CONN_CLOSING,
 	_(QUIC_FL_CONN_DRAINING,
-	_(QUIC_FL_CONN_IMMEDIATE_CLOSE))))))))))))))))))))))));
+	_(QUIC_FL_CONN_IMMEDIATE_CLOSE)))))))))))))))))))))))));
 	/* epilogue */
 	_(~0U);
 	return buf;
diff --git a/include/haproxy/quic_conn.h b/include/haproxy/quic_conn.h
index 7e6adf51d..56367f1b4 100644
--- a/include/haproxy/quic_conn.h
+++ b/include/haproxy/quic_conn.h
@@ -82,6 +82,12 @@ void qc_check_close_on_released_mux(struct quic_conn *qc);
 int quic_stateless_reset_token_cpy(unsigned char *pos, size_t len,
                                    const unsigned char *salt, size_t saltlen);
 
+/* Returns true if <qc> is used on the backed side (as a client). */
+static inline int qc_is_back(const struct quic_conn *qc)
+{
+	return qc->flags & QUIC_FL_CONN_IS_BACK;
+}
+
 /* Free the CIDs attached to <conn> QUIC connection. */
 static inline void free_quic_conn_cids(struct quic_conn *conn)
 {
diff --git a/src/quic_conn.c b/src/quic_conn.c
index 874f7ecb4..2917ad062 100644
--- a/src/quic_conn.c
+++ b/src/quic_conn.c
@@ -1198,7 +1198,7 @@ struct quic_conn *qc_new_conn(const struct quic_version *qv, int ipv4,
 	else {
 		struct quic_connection_id *conn_cid = NULL;
 
-		qc->flags = QUIC_FL_CONN_PEER_VALIDATED_ADDR;
+		qc->flags = QUIC_FL_CONN_IS_BACK|QUIC_FL_CONN_PEER_VALIDATED_ADDR;
 		qc->state = QUIC_HS_ST_CLIENT_INITIAL;
 
 		/* This is the original connection ID from the peer server
diff --git a/src/quic_trace.c b/src/quic_trace.c
index c8fe5524b..6fa260df6 100644
--- a/src/quic_trace.c
+++ b/src/quic_trace.c
@@ -115,8 +115,9 @@ static void quic_trace(enum trace_level level, uint64_t mask, const struct trace
 	if (qc) {
 		const struct quic_tls_ctx *tls_ctx;
 
-		chunk_appendf(&trace_buf, " : qc@%p idle_timer_task@%p flags=0x%x",
-		              qc, qc->idle_timer_task, qc->flags);
+		chunk_appendf(&trace_buf, " : qc@%p(%c) idle_timer_task@%p flags=0x%x",
+		              qc, (qc->flags & QUIC_FL_CONN_IS_BACK) ? 'B' : 'F',
+		              qc->idle_timer_task, qc->flags);
 		if (mask & QUIC_EV_CONN_NEW) {
 			const int *ssl_err = a2;