diff --git a/src/security/validator.cpp b/src/security/validator.cpp
index 62289f5..ebb8b55 100644
--- a/src/security/validator.cpp
+++ b/src/security/validator.cpp
@@ -6,6 +6,8 @@
  * See COPYING for copyright and distribution information.
  */
 
+#include "common.hpp"
+
 #include "validator.hpp"
 #include "../util/logging.hpp"