diff --git a/src/rescorer/rescorer_main.cu b/src/rescorer/rescorer_main.cu
index a5b5fb3a..8126252a 100644
--- a/src/rescorer/rescorer_main.cu
+++ b/src/rescorer/rescorer_main.cu
@@ -1,3 +1,5 @@
+#include <boost/utility/result_of.hpp>
+
 #include <iostream>
 #include <string>
 #include <memory>