diff --git a/include/boost/python/object/value_holder.hpp b/include/boost/python/object/value_holder.hpp
index 49251921..b586d6e9 100644
--- a/include/boost/python/object/value_holder.hpp
+++ b/include/boost/python/object/value_holder.hpp
@@ -14,6 +14,7 @@
 # include <boost/python/object/forward.hpp>
 # include <boost/python/detail/preprocessor.hpp>
 # include <boost/preprocessor/enum_params.hpp>
+# include <boost/preprocessor/expr_if.hpp>
 
 namespace boost { namespace python { namespace objects {