diff --git a/src/server.c b/src/server.c
index 996c2084..a5c85021 100644
--- a/src/server.c
+++ b/src/server.c
@@ -42,7 +42,9 @@
 
 int verbose = 0;
 int udprelay = 0;
+#ifdef TCP_FASTOPEN
 static int fast_open = 0;
+#endif
 static int remote_conn = 0;
 static int server_conn = 0;