1 files changed, 7 insertions, 4 deletions
diff --git a/src/stream_engine.hpp b/src/stream_engine.hpp
index 6d122ed..30b190b 100644
--- a/src/stream_engine.hpp
+++ b/src/stream_engine.hpp
@@ -34,6 +34,9 @@
 namespace zmq
 {
 
+    class io_thread_t;
+    class session_base_t;
+
     //  This engine handles any socket with SOCK_STREAM semantics,
     //  e.g. TCP socket or an UNIX domain socket.
 
@@ -45,8 +48,8 @@ namespace zmq
         ~stream_engine_t ();
 
         //  i_engine interface implementation.
-        void plug (class io_thread_t *io_thread_,
-           class session_base_t *session_);
+        void plug (zmq::io_thread_t *io_thread_,
+           zmq::session_base_t *session_);
         void unplug ();
         void terminate ();
         void activate_in ();
@@ -86,10 +89,10 @@ namespace zmq
         encoder_t encoder;
 
         //  The session this engine is attached to.
-        class session_base_t *session;
+        zmq::session_base_t *session;
 
         //  Detached transient session.
-        class session_base_t *leftover_session;
+        zmq::session_base_t *leftover_session;
 
         options_t options;