diff --git a/src/tcpcheck.c b/src/tcpcheck.c
index ec1fede..8808a0c 100644
--- a/src/tcpcheck.c
+++ b/src/tcpcheck.c
@@ -39,6 +39,7 @@
 #include <haproxy/check.h>
 #include <haproxy/chunk.h>
 #include <haproxy/connection.h>
+#include <haproxy/errors.h>
 #include <haproxy/global.h>
 #include <haproxy/h1.h>
 #include <haproxy/http.h>