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diff --git a/src/i_msg_source.hpp b/src/i_msg_source.hpp
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+/*
+    Copyright (c) 2007-2012 iMatix Corporation
+    Copyright (c) 2007-2012 Other contributors as noted in the AUTHORS file
+
+    This file is part of 0MQ.
+
+    0MQ is free software; you can redistribute it and/or modify it under
+    the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    0MQ is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __ZMQ_I_MSG_SOURCE_HPP_INCLUDED__
+#define __ZMQ_I_MSG_SOURCE_HPP_INCLUDED__
+
+namespace zmq
+{
+
+    //  Forward declaration
+    class msg_t;
+
+    //  Interface to be implemented by message source.
+
+    struct i_msg_source
+    {
+        virtual ~i_msg_source () {}
+
+        //  Fetch a message. Returns 0 if successful; -1 otherwise.
+        //  The caller is responsible for freeing the message when no
+        //  longer used.
+        virtual int pull_msg (msg_t *msg_) = 0;
+    };
+
+}
+
+#endif