diff --git a/gvc-channel-map.c b/gvc-channel-map.c
index bf4d737..688a451 100644
--- a/gvc-channel-map.c
+++ b/gvc-channel-map.c
@@ -166,8 +166,7 @@ gvc_channel_map_class_init (GvcChannelMapClass *klass)
                               G_TYPE_FROM_CLASS (klass),
                               G_SIGNAL_RUN_LAST,
                               G_STRUCT_OFFSET (GvcChannelMapClass, volume_changed),
-                              NULL, NULL,
-                              g_cclosure_marshal_VOID__BOOLEAN,
+                              NULL, NULL, NULL,
                               G_TYPE_NONE, 1, G_TYPE_BOOLEAN);
 }