diff --git a/src/game.cpp b/src/game.cpp
index 2db06d191df6..b82e696d4268 100644
--- a/src/game.cpp
+++ b/src/game.cpp
@@ -66,6 +66,7 @@
 #include <boost/program_options/errors.hpp>  // for error
 #include <boost/scoped_ptr.hpp>         // for scoped_ptr
 #include <boost/tuple/tuple.hpp>        // for tuple
+#include <boost/variant/apply_visitor.hpp>
 #include <cerrno>                       // for ENOMEM
 #include <clocale>                      // for setlocale, NULL, LC_ALL, etc
 #include <cstdio>                      // for remove, fprintf, stderr