diff --git a/websocketpp/config/asio.hpp b/websocketpp/config/asio.hpp
index 166c7d33c0..4af0dcc5f6 100644
--- a/websocketpp/config/asio.hpp
+++ b/websocketpp/config/asio.hpp
@@ -51,6 +51,8 @@ struct asio_tls : public core {
 	
 	typedef core::alog_type alog_type;
 	typedef core::alog_type elog_type;
+	
+	typedef core::rng_type rng_type;
 
     struct transport_config {
         typedef asio_tls::concurrency_type concurrency_type;
diff --git a/websocketpp/config/asio_no_tls.hpp b/websocketpp/config/asio_no_tls.hpp
index 47627e89b2..36bf595de4 100644
--- a/websocketpp/config/asio_no_tls.hpp
+++ b/websocketpp/config/asio_no_tls.hpp
@@ -47,6 +47,8 @@ struct asio : public core {
 	typedef core::alog_type alog_type;
 	typedef core::alog_type elog_type;
     
+    typedef core::rng_type rng_type;
+    
     struct transport_config {
         typedef asio::concurrency_type concurrency_type;
         typedef asio::alog_type alog_type;
diff --git a/websocketpp/config/core.hpp b/websocketpp/config/core.hpp
index 63f820c397..bcbc1d2440 100644
--- a/websocketpp/config/core.hpp
+++ b/websocketpp/config/core.hpp
@@ -28,6 +28,9 @@
 #ifndef WEBSOCKETPP_CONFIG_CORE_HPP
 #define WEBSOCKETPP_CONFIG_CORE_HPP
 
+// Integers
+#include <websocketpp/common/stdint.hpp>
+
 // Concurrency
 #include <websocketpp/concurrency/basic.hpp>
 
@@ -45,6 +48,9 @@
 // Loggers
 #include <websocketpp/logger/basic.hpp>
 
+// RNG
+#include <websocketpp/random/random_device.hpp>
+
 // Extensions
 #include <websocketpp/extensions/permessage_compress/disabled.hpp>
 
@@ -73,6 +79,10 @@ struct core {
 	typedef websocketpp::log::basic<concurrency_type,
 	    websocketpp::log::alevel> alog_type;
 	
+	/// RNG policies
+	typedef websocketpp::random::random_device<uint32_t,concurrency_type> 
+	    rng_type;
+	
     struct transport_config {
         typedef core::concurrency_type concurrency_type;
         typedef core::elog_type elog_type;