diff --git a/websocketpp/transport/iostream/connection.hpp b/websocketpp/transport/iostream/connection.hpp
index e9162101d5..7a92d27ecd 100644
--- a/websocketpp/transport/iostream/connection.hpp
+++ b/websocketpp/transport/iostream/connection.hpp
@@ -61,7 +61,8 @@ public:
 	typedef typename concurrency_type::mutex_type mutex_type;
 	
 	explicit connection(bool is_server, alog_type& alog, elog_type& elog)
-	  : m_reading(false)
+	  : m_output_stream(NULL)
+	  , m_reading(false)
 	  , m_is_server(is_server)
 	  , m_alog(alog)
 	  , m_elog(elog)