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diff --git a/include/haproxy/quic_loss-t.h b/include/haproxy/quic_loss-t.h
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+++ b/include/haproxy/quic_loss-t.h
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+/*
+ * include/types/quic_loss.h
+ * This file contains definitions for QUIC loss detection.
+ *
+ * Copyright 2019 HAProxy Technologies, Frederic Lecaille <flecaille@haproxy.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation, version 2.1
+ * exclusively.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#ifndef _TYPES_QUIC_LOSS_H
+#define _TYPES_QUIC_LOSS_H
+#ifdef USE_QUIC
+#ifndef USE_OPENSSL
+#error "Must define USE_OPENSSL"
+#endif
+
+#include <inttypes.h>
+
+/* Maximum reordering in packets. */
+#define QUIC_LOSS_PACKET_THRESHOLD         3
+#define QUIC_TIMER_GRANULARITY            1U /* 1ms   */
+#define QUIC_LOSS_INITIAL_RTT           333U /* 333ms */
+
+/* QUIC loss time threshold expressed an RTT multiplier
+ * (QUIC_LOSS_TIME_THRESHOLD_MULTIPLICAND / QUIC_LOSS_TIME_THRESHOLD_DIVISOR)
+ */
+#define QUIC_LOSS_TIME_THRESHOLD_MULTIPLICAND 9
+#define QUIC_LOSS_TIME_THRESHOLD_DIVISOR      8
+
+/* Note that all the unit of variables for QUIC LOSS detections
+ * is the tick.
+ */
+
+struct quic_loss {
+	/* The most recent RTT measurement (ms) */
+	unsigned int latest_rtt;
+	/* Smoothed RTT (ms) */
+	unsigned int srtt;
+	/* RTT variation (ms) */
+	unsigned int rtt_var;
+	/* Minimum RTT (ms) */
+	unsigned int rtt_min;
+	/* Number of NACKed sent PTO. */
+	unsigned int pto_count;
+	unsigned long nb_lost_pkt;
+	unsigned long nb_reordered_pkt;
+};
+
+#endif /* USE_QUIC */
+#endif /* _TYPES_QUIC_LOSS_H */