diff --git a/src/m3ua.c b/src/m3ua.c
index f4dbf766..fcbc7590 100644
--- a/src/m3ua.c
+++ b/src/m3ua.c
@@ -310,9 +310,6 @@ void m3ua_dh_to_xfer_param(struct osmo_mtp_transfer_param *param,
 		     (mdh->ni & 0x3 << 6);
 }
 
-#define M3UA_MSG_SIZE 2048
-#define M3UA_MSG_HEADROOM 512
-
 struct msgb *m3ua_msgb_alloc(const char *name)
 {
 	if (!name)
diff --git a/src/osmo_ss7_asp.c b/src/osmo_ss7_asp.c
index 92b3a5bb..1f457492 100644
--- a/src/osmo_ss7_asp.c
+++ b/src/osmo_ss7_asp.c
@@ -43,6 +43,7 @@
 #include <osmocom/core/msgb.h>
 #include <osmocom/core/socket.h>
 #include <osmocom/core/sockaddr_str.h>
+#include <osmocom/core/osmo_io.h>
 
 #include <osmocom/netif/stream.h>
 #include <osmocom/netif/ipa.h>
@@ -900,6 +901,8 @@ static int xua_cli_connect_cb(struct osmo_stream_cli *cli)
 	if (fd < 0)
 		return fd;
 
+	osmo_iofd_set_alloc_info(osmo_stream_cli_get_iofd(cli), M3UA_MSG_SIZE, M3UA_MSG_HEADROOM);
+
 	/* update the socket name */
 	talloc_free(asp->sock_name);
 	asp->sock_name = osmo_sock_get_name(asp, fd);
diff --git a/src/osmo_ss7_xua_srv.c b/src/osmo_ss7_xua_srv.c
index eeb67680..473826fd 100644
--- a/src/osmo_ss7_xua_srv.c
+++ b/src/osmo_ss7_xua_srv.c
@@ -43,6 +43,7 @@
 #include <osmocom/core/msgb.h>
 #include <osmocom/core/socket.h>
 #include <osmocom/core/sockaddr_str.h>
+#include <osmocom/core/osmo_io.h>
 
 #include <osmocom/netif/stream.h>
 #include <osmocom/netif/ipa.h>
@@ -80,6 +81,8 @@ static int xua_accept_cb(struct osmo_stream_srv_link *link, int fd)
 		return -1;
 	}
 
+	osmo_iofd_set_alloc_info(osmo_stream_srv_get_iofd(srv), M3UA_MSG_SIZE, M3UA_MSG_HEADROOM);
+
 	switch (oxs->cfg.proto) {
 	case OSMO_SS7_ASP_PROT_IPA:
 		osmo_stream_srv_set_read_cb(srv, ss7_asp_ipa_srv_conn_rx_cb);
diff --git a/src/xua_internal.h b/src/xua_internal.h
index b6b33af4..d4b16f92 100644
--- a/src/xua_internal.h
+++ b/src/xua_internal.h
@@ -4,6 +4,9 @@
 #include <osmocom/sigtran/osmo_ss7.h>
 #include <osmocom/sigtran/xua_msg.h>
 
+#define M3UA_MSG_SIZE 2048
+#define M3UA_MSG_HEADROOM 512
+
 struct osmo_sccp_addr;
 struct m3ua_data_hdr;