diff --git a/Release/include/cpprest/http_listener.h b/Release/include/cpprest/http_listener.h
index 3c154e49a6..88faa97da1 100644
--- a/Release/include/cpprest/http_listener.h
+++ b/Release/include/cpprest/http_listener.h
@@ -21,7 +21,7 @@
 #include <boost/asio/ssl.hpp>
 #endif
 
-#if !defined(_WIN32) || (_WIN32_WINNT >= _WIN32_WINNT_VISTA && !defined(__cplusplus_winrt))
+#if !defined(_WIN32) || (_WIN32_WINNT >= _WIN32_WINNT_VISTA && !defined(__cplusplus_winrt)) || defined(CPPREST_FORCE_HTTP_LISTENER_ASIO)
 
 namespace web
 {