diff --git a/net/rpmsg/rpmsg_sockif.c b/net/rpmsg/rpmsg_sockif.c
index 7fcc0ecf8e2..10b67d2f618 100644
--- a/net/rpmsg/rpmsg_sockif.c
+++ b/net/rpmsg/rpmsg_sockif.c
@@ -607,7 +607,8 @@ static int rpmsg_socket_setaddr(FAR struct rpmsg_socket_conn_s *conn,
 
   if (suffix)
     {
-      snprintf(conn->nameid, sizeof(conn->nameid), ":%llx", g_rpmsg_id++);
+      snprintf(conn->nameid, sizeof(conn->nameid), ":%" PRIx64,
+               g_rpmsg_id++);
     }
   else
     {