diff --git a/src/transport_layer/socket_monitor.c b/src/transport_layer/socket_monitor.c
index 1f6cc5c7..12f486d3 100644
--- a/src/transport_layer/socket_monitor.c
+++ b/src/transport_layer/socket_monitor.c
@@ -227,6 +227,10 @@ static void socket_monitor_read_cb(int fd, void* arg) {
 /* ===== FreeBSD: AF_ROUTE routing socket ===== */
 #elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
 
+#ifndef RT_ROUNDUP
+#define RT_ROUNDUP(x) (((x) + sizeof(long) - 1) & ~(sizeof(long) - 1))
+#endif
+
 static int sockaddr_to_plen(const struct sockaddr* sa) {
     if (!sa || sa->sa_len == 0) return 0;
     switch (sa->sa_family) {
@@ -356,6 +360,7 @@ static void socket_monitor_bsd_read_cb(int fd, void* arg) {
             break;
         }
     }
+    }
 }
 
 /* ===== Windows: IP Helper callbacks ===== */