diff --git a/include/boost/mpl/empty_base.hpp b/include/boost/mpl/empty_base.hpp
index 69630a5..cb56ef6 100644
--- a/include/boost/mpl/empty_base.hpp
+++ b/include/boost/mpl/empty_base.hpp
@@ -19,6 +19,7 @@
 #include <boost/mpl/aux_/config/workaround.hpp>
 #include <boost/mpl/aux_/lambda_support.hpp>
 
+#include <boost/type_traits/integral_constant.hpp>
 #include <boost/type_traits/is_empty.hpp>
 
 namespace boost { namespace mpl {