diff --git a/include/hardware/audio.h b/include/hardware/audio.h
index 59fb9a3..763ca58 100644
--- a/include/hardware/audio.h
+++ b/include/hardware/audio.h
@@ -124,6 +124,8 @@
 #define AUDIO_PARAMETER_STREAM_INPUT_SOURCE "input_source"   /* audio_source_t */
 #define AUDIO_PARAMETER_STREAM_SAMPLING_RATE "sampling_rate" /* uint32_t */
 
+#define AUDIO_PARAMETER_DEVICE_DISCONNECT "disconnect"      /* audio_devices_t */
+
 /* Query supported formats. The response is a '|' separated list of strings from
  * audio_format_t enum e.g: "sup_formats=AUDIO_FORMAT_PCM_16_BIT" */
 #define AUDIO_PARAMETER_STREAM_SUP_FORMATS "sup_formats"