diff --git a/src/vars.c b/src/vars.c
index d58e1a3..2e32583 100644
--- a/src/vars.c
+++ b/src/vars.c
@@ -10,6 +10,7 @@
 #include <haproxy/list.h>
 #include <haproxy/sample.h>
 #include <haproxy/stream-t.h>
+#include <haproxy/tcpcheck.h>
 #include <haproxy/tcp_rules.h>
 #include <haproxy/vars.h>