diff --git a/src/server.c b/src/server.c
index 0d9b533..b2c2853 100644
--- a/src/server.c
+++ b/src/server.c
@@ -27,6 +27,7 @@
 #include <haproxy/dns.h>
 #include <haproxy/errors.h>
 #include <haproxy/global.h>
+#include <haproxy/mailers.h>
 #include <haproxy/namespace.h>
 #include <haproxy/queue.h>
 #include <haproxy/sample.h>