diff --git a/src/flags.cpp b/src/flags.cpp
index 8ddeb0cf..b3e11db1 100644
--- a/src/flags.cpp
+++ b/src/flags.cpp
@@ -1,6 +1,7 @@
 
 
 #include <stdlib.h>
+#include <stdexcept>
 
 #include "flags.hpp"