diff --git a/include/sqlpp11/where.h b/include/sqlpp11/where.h
index 01eb449e..e8ffae31 100644
--- a/include/sqlpp11/where.h
+++ b/include/sqlpp11/where.h
@@ -230,8 +230,9 @@ namespace sqlpp
   using check_where_t = static_combined_check_t<
       static_check_t<logic::all_t<detail::is_expression_impl<Expressions>::type::value...>::value,
                      assert_where_expressions_t>,
-      static_check_t<logic::all_t<std::is_same<value_type_of<Expressions>, boolean>::value...>::value,
-                     assert_where_boolean_t>,
+      static_check_t<
+          logic::all_t<std::is_same<typename detail::value_type_of_impl<Expressions>::type, boolean>::value...>::value,
+          assert_where_boolean_t>,
       static_check_t<logic::all_t<(not detail::contains_aggregate_function_impl<Expressions>::type::value)...>::value,
                      assert_where_no_aggregate_functions_t>>;