diff --git a/include/haproxy/quic_cc-t.h b/include/haproxy/quic_cc-t.h
index a4a43cadc3..173e0fb684 100644
--- a/include/haproxy/quic_cc-t.h
+++ b/include/haproxy/quic_cc-t.h
@@ -31,6 +31,7 @@
 
 #include <haproxy/buf-t.h>
 #include <haproxy/quic_loss-t.h>
+#include <haproxy/quic_tx-t.h>
 
 #define QUIC_CC_INFINITE_SSTHESH ((uint32_t)-1)
 
@@ -136,6 +137,16 @@ struct quic_cc_algo {
 	/* Defined only if pacing is used. */
 	uint (*pacing_rate)(const struct quic_cc *cc);
 	uint (*pacing_burst)(const struct quic_cc *cc);
+
+	struct quic_cc_drs *(*get_drs)(struct quic_cc *cc);
+	void (*on_transmit)(struct quic_cc *cc);
+	void (*drs_on_transmit)(struct quic_cc *cc, struct quic_tx_packet *pkt);
+	void (*on_ack_rcvd)(struct quic_cc *cc, uint32_t acked, uint32_t delivered,
+	                    uint32_t ack_rtt, uint32_t bytes_lost,
+	                    unsigned int largest_pkt_sent_ts);
+	void (*on_pkt_lost)(struct quic_cc *cc,
+	                    struct quic_tx_packet *pkt, uint32_t lost_bytes);
+	void (*congestion_event)(struct quic_cc *cc, uint32_t ts);
 };
 
 #endif /* USE_QUIC */
diff --git a/src/quic_cc.c b/src/quic_cc.c
index b6bfa86a77..9c5a8f6937 100644
--- a/src/quic_cc.c
+++ b/src/quic_cc.c
@@ -21,6 +21,7 @@
  */
 
 #include <haproxy/quic_cc.h>
+#include <haproxy/quic_pacing.h>
 
 struct quic_cc_algo *default_quic_cc_algo = &quic_cc_algo_cubic;
 
@@ -40,7 +41,8 @@ void quic_cc_init(struct quic_cc *cc,
 /* Send <ev> event to <cc> congestion controller. */
 void quic_cc_event(struct quic_cc *cc, struct quic_cc_event *ev)
 {
-	cc->algo->event(cc, ev);
+	if (cc->algo->event)
+		cc->algo->event(cc, ev);
 }
 
 void quic_cc_state_trace(struct buffer *buf, const struct quic_cc *cc)