diff --git a/android/avrcp-lib.h b/android/avrcp-lib.h
index add7739..6554b12 100644
--- a/android/avrcp-lib.h
+++ b/android/avrcp-lib.h
@@ -224,7 +224,7 @@
 					char **text, void *user_data);
 	bool (*register_notification) (struct avrcp *session, int err,
 					uint8_t code, uint8_t event,
-					uint8_t *params, void *user_data);
+					void *params, void *user_data);
 	void (*set_volume) (struct avrcp *session, int err, uint8_t volume,
 					void *user_data);
 	void (*set_addressed) (struct avrcp *session, int err,
diff --git a/android/avrcp.c b/android/avrcp.c
index bcb4228..8c3e25a 100644
--- a/android/avrcp.c
+++ b/android/avrcp.c
@@ -748,11 +748,12 @@
 
 static bool handle_register_notification_rsp(struct avrcp *session, int err,
 						uint8_t code, uint8_t event,
-						uint8_t *params,
+						void *params,
 						void *user_data)
 {
 	struct avrcp_device *dev = user_data;
 	struct hal_ev_avrcp_volume_changed ev;
+	uint8_t *volume = params;
 
 	if (err < 0) {
 		error("AVRCP: %s", strerror(-err));
@@ -766,7 +767,7 @@
 		return false;
 
 	ev.type = code;
-	ev.volume = params[0] & 0x7f;
+	ev.volume = volume[0];
 
 	ipc_send_notif(hal_ipc, HAL_SERVICE_ID_AVRCP,
 					HAL_EV_AVRCP_VOLUME_CHANGED,
diff --git a/unit/test-avrcp.c b/unit/test-avrcp.c
index a610ad5..01307e6 100644
--- a/unit/test-avrcp.c
+++ b/unit/test-avrcp.c
@@ -826,22 +826,23 @@
 
 static bool register_notification_rsp(struct avrcp *session, int err,
 					uint8_t code, uint8_t event,
-					uint8_t *params, void *user_data)
+					void *params, void *user_data)
 {
 	struct context *context = user_data;
+	uint8_t *p = params;
 
 	g_assert_cmpint(err, ==, 0);
 
 	switch (event) {
 	case AVRCP_EVENT_VOLUME_CHANGED:
 		if (g_str_equal(context->data->test_name, "/TP/VLH/BV-03-C")) {
-			g_assert_cmpint(params[0], ==, 0);
+			g_assert_cmpint(p[0], ==, 0);
 			break;
 		} else if (code == AVC_CTYPE_INTERIM) {
-			g_assert_cmpint(params[0], ==, 0);
+			g_assert_cmpint(p[0], ==, 0);
 			return true;
 		}
-		g_assert_cmpint(params[0], ==, 1);
+		g_assert_cmpint(p[0], ==, 1);
 		break;
 	}