diff --git a/repos/os/include/audio_out_session/audio_out_session.h b/repos/os/include/audio_out_session/audio_out_session.h
index 1067f98a3f..1867908411 100644
--- a/repos/os/include/audio_out_session/audio_out_session.h
+++ b/repos/os/include/audio_out_session/audio_out_session.h
@@ -170,6 +170,13 @@ class Audio_out::Stream
 		 */
 		unsigned pos() const { return _pos; }
 
+		/**
+		 * Current audio allocation position
+		 *
+		 * \return position
+		 */
+		unsigned tail() const { return _tail; }
+
 		/**
 		 * Retrieve next packet for given packet
 		 *