diff --git a/posix/JackSocketServerChannel.h b/posix/JackSocketServerChannel.h
index 11581890..98a812aa 100644
--- a/posix/JackSocketServerChannel.h
+++ b/posix/JackSocketServerChannel.h
@@ -28,6 +28,8 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 namespace Jack
 {
 
+class JackServer;
+
 /*!
 \brief JackServerChannel using sockets.
 */