diff --git a/boost/network/protocol/http/policies/async_resolver.hpp b/boost/network/protocol/http/policies/async_resolver.hpp
index a8fb5b052..61a710147 100644
--- a/boost/network/protocol/http/policies/async_resolver.hpp
+++ b/boost/network/protocol/http/policies/async_resolver.hpp
@@ -53,7 +53,7 @@ struct async_resolver : boost::enable_shared_from_this<async_resolver<Tag> > {
       }
     }
 
-    typename resolver_type::query q(resolver_type::protocol_type::v4(), host,
+    typename resolver_type::query q(host,
                                     lexical_cast<string_type>(port));
     resolver_.async_resolve(q, resolver_strand_->wrap(boost::bind(
                                    &async_resolver<Tag>::handle_resolve,