diff --git a/include/haproxy/proto_sockpair.h b/include/haproxy/proto_sockpair.h
index e012407..bb0256e 100644
--- a/include/haproxy/proto_sockpair.h
+++ b/include/haproxy/proto_sockpair.h
@@ -22,6 +22,7 @@
 #define _HAPROXY_PROTO_SOCKPAIR_H
 
 extern struct proto_fam proto_fam_sockpair;
+extern struct protocol proto_sockpair;
 
 int recv_fd_uxst(int sock);
 int send_fd_uxst(int fd, int send_fd);
diff --git a/include/haproxy/proto_tcp.h b/include/haproxy/proto_tcp.h
index 63bbb57..52566db 100644
--- a/include/haproxy/proto_tcp.h
+++ b/include/haproxy/proto_tcp.h
@@ -28,6 +28,9 @@
 #include <haproxy/listener-t.h>
 #include <haproxy/sample-t.h>
 
+extern struct protocol proto_tcp4;
+extern struct protocol proto_tcp6;
+
 int tcp_bind_socket(int fd, int flags, struct sockaddr_storage *local, struct sockaddr_storage *remote);
 int tcp_connect_server(struct connection *conn, int flags);
 int tcp_is_foreign(int fd, sa_family_t family);
diff --git a/include/haproxy/proto_udp.h b/include/haproxy/proto_udp.h
index 25c1423..7de8413 100644
--- a/include/haproxy/proto_udp.h
+++ b/include/haproxy/proto_udp.h
@@ -1,5 +1,5 @@
 /*
- * include/proto/proto_udp.h
+ * include/haproxy/proto_udp.h
  * This file contains UDP socket protocol definitions.
  *
  * Copyright 2019 HAProxy Technologies, Frédéric Lécaille <flecaille@haproxy.com>
@@ -24,6 +24,9 @@
 #ifndef _PROTO_PROTO_UDP_H
 #define _PROTO_PROTO_UDP_H
 
+extern struct protocol proto_udp4;
+extern struct protocol proto_udp6;
+
 int udp_bind_socket(int fd, int flags, struct sockaddr_storage *local, struct sockaddr_storage *remote);
 
 #endif /* _PROTO_PROTO_UDP_H */
diff --git a/include/haproxy/proto_uxst.h b/include/haproxy/proto_uxst.h
new file mode 100644
index 0000000..77caf3d
--- /dev/null
+++ b/include/haproxy/proto_uxst.h
@@ -0,0 +1,34 @@
+/*
+ * include/haproxy/proto_uxst.h
+ * This file contains UNIX stream socket protocol definitions.
+ *
+ * Copyright (C) 2000-2013 Willy Tarreau - w@1wt.eu
+ *
+ * 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 _PROTO_PROTO_UXST_H
+#define _PROTO_PROTO_UXST_H
+
+extern struct protocol proto_uxst;
+
+#endif /* _PROTO_PROTO_UXST_H */
+
+/*
+ * Local variables:
+ *  c-indent-level: 8
+ *  c-basic-offset: 8
+ * End:
+ */
diff --git a/src/proto_sockpair.c b/src/proto_sockpair.c
index 2f691f7..9d2fb11 100644
--- a/src/proto_sockpair.c
+++ b/src/proto_sockpair.c
@@ -63,7 +63,7 @@
 };
 
 /* Note: must not be declared <const> as its list will be overwritten */
-static struct protocol proto_sockpair = {
+struct protocol proto_sockpair = {
 	.name = "sockpair",
 	.fam = &proto_fam_sockpair,
 	.ctrl_type = SOCK_STREAM,
diff --git a/src/proto_tcp.c b/src/proto_tcp.c
index eecb299..b3f648e 100644
--- a/src/proto_tcp.c
+++ b/src/proto_tcp.c
@@ -51,7 +51,7 @@
 static void tcp_disable_listener(struct listener *listener);
 
 /* Note: must not be declared <const> as its list will be overwritten */
-static struct protocol proto_tcpv4 = {
+struct protocol proto_tcpv4 = {
 	.name = "tcpv4",
 	.fam = &proto_fam_inet4,
 	.ctrl_type = SOCK_STREAM,
@@ -80,7 +80,7 @@
 INITCALL1(STG_REGISTER, protocol_register, &proto_tcpv4);
 
 /* Note: must not be declared <const> as its list will be overwritten */
-static struct protocol proto_tcpv6 = {
+struct protocol proto_tcpv6 = {
 	.name = "tcpv6",
 	.fam = &proto_fam_inet6,
 	.ctrl_type = SOCK_STREAM,
diff --git a/src/proto_udp.c b/src/proto_udp.c
index 12e25af..a883967 100644
--- a/src/proto_udp.c
+++ b/src/proto_udp.c
@@ -47,7 +47,7 @@
 static void udp_disable_listener(struct listener *listener);
 
 /* Note: must not be declared <const> as its list will be overwritten */
-static struct protocol proto_udp4 = {
+struct protocol proto_udp4 = {
 	.name = "udp4",
 	.fam = &proto_fam_inet4,
 	.ctrl_type = SOCK_DGRAM,
@@ -72,7 +72,7 @@
 INITCALL1(STG_REGISTER, protocol_register, &proto_udp4);
 
 /* Note: must not be declared <const> as its list will be overwritten */
-static struct protocol proto_udp6 = {
+struct protocol proto_udp6 = {
 	.name = "udp6",
 	.fam = &proto_fam_inet6,
 	.ctrl_type = SOCK_DGRAM,
diff --git a/src/proto_uxst.c b/src/proto_uxst.c
index 52e90ae..8cf541d 100644
--- a/src/proto_uxst.c
+++ b/src/proto_uxst.c
@@ -33,6 +33,7 @@
 #include <haproxy/listener.h>
 #include <haproxy/log.h>
 #include <haproxy/protocol.h>
+#include <haproxy/proto_uxst.h>
 #include <haproxy/sock.h>
 #include <haproxy/sock_unix.h>
 #include <haproxy/time.h>
@@ -47,7 +48,7 @@
 static int uxst_suspend_receiver(struct receiver *rx);
 
 /* Note: must not be declared <const> as its list will be overwritten */
-static struct protocol proto_unix = {
+struct protocol proto_uxst = {
 	.name = "unix_stream",
 	.fam = &proto_fam_unix,
 	.ctrl_type = SOCK_STREAM,
@@ -67,11 +68,11 @@
 	.rx_listening = sock_accepting_conn,
 	.default_iocb = &sock_accept_iocb,
 	.connect = &uxst_connect_server,
-	.receivers = LIST_HEAD_INIT(proto_unix.receivers),
+	.receivers = LIST_HEAD_INIT(proto_uxst.receivers),
 	.nb_receivers = 0,
 };
 
-INITCALL1(STG_REGISTER, protocol_register, &proto_unix);
+INITCALL1(STG_REGISTER, protocol_register, &proto_uxst);
 
 /********************************
  * 1) low-level socket functions