diff --git a/src/http_htx.c b/src/http_htx.c
index c3422d4..67e4298 100644
--- a/src/http_htx.c
+++ b/src/http_htx.c
@@ -26,6 +26,7 @@
 #include <haproxy/log.h>
 #include <haproxy/regex.h>
 #include <haproxy/sample.h>
+#include <haproxy/tools.h>
 
 
 struct buffer http_err_chunks[HTTP_ERR_SIZE];