diff --git a/src/engine/server/sql_string_helpers.h b/src/engine/server/sql_string_helpers.h
index bb9ae80bb..120a221af 100644
--- a/src/engine/server/sql_string_helpers.h
+++ b/src/engine/server/sql_string_helpers.h
@@ -1,6 +1,8 @@
 #ifndef ENGINE_SERVER_SQL_STRING_HELPERS_H
 #define ENGINE_SERVER_SQL_STRING_HELPERS_H
 
+#include <base/system.h>
+
 namespace sqlstr
 {