diff --git a/tests/test_stcp_link.c b/tests/test_stcp_link.c
index cf2f0447..1d6d3a0d 100644
--- a/tests/test_stcp_link.c
+++ b/tests/test_stcp_link.c
@@ -1,6 +1,7 @@
 // test_stcp_link.c — STCP link layer: server listen/accept (slim config) + client connect (raw stcp_client)
 #include "stcp_link.h"
 #include "stcp_client.h"
+#include "stcp_server.h"
 #include "secure_channel.h"
 #include "utun_instance.h"
 #include "etcp.h"