diff --git a/include/hardware/audio_policy.h b/include/hardware/audio_policy.h
index 6dd5fd7..9e145f8 100644
--- a/include/hardware/audio_policy.h
+++ b/include/hardware/audio_policy.h
@@ -232,6 +232,9 @@
                              audio_stream_type_t stream,
                              uint32_t in_past_ms);
 
+    bool (*is_source_active)(const struct audio_policy *pol,
+                             audio_source_t source);
+
     /* dump state */
     int (*dump)(const struct audio_policy *pol, int fd);
 };