diff --git a/spa/plugins/audioconvert/audioconvert.c b/spa/plugins/audioconvert/audioconvert.c
index 7d4abfb00..558dad2a3 100644
--- a/spa/plugins/audioconvert/audioconvert.c
+++ b/spa/plugins/audioconvert/audioconvert.c
@@ -557,6 +557,7 @@ static int impl_node_set_io(void *object, uint32_t id, void *data, size_t size)
 	switch (id) {
 	case SPA_IO_Position:
 		res = spa_node_set_io(this->resample, id, data, size);
+		res = spa_node_set_io(this->channelmix, id, data, size);
 		res = spa_node_set_io(this->fmt[0], id, data, size);
 		res = spa_node_set_io(this->fmt[1], id, data, size);
 		break;
diff --git a/spa/plugins/audioconvert/channelmix.c b/spa/plugins/audioconvert/channelmix.c
index 7cfe7193e..f17ab25f9 100644
--- a/spa/plugins/audioconvert/channelmix.c
+++ b/spa/plugins/audioconvert/channelmix.c
@@ -144,6 +144,8 @@ struct impl {
 	struct spa_log *log;
 	struct spa_cpu *cpu;
 
+	struct spa_io_position *io_position;
+
 	struct spa_hook_list hooks;
 
 	uint64_t info_all;
@@ -595,7 +597,20 @@ static int apply_midi(struct impl *this, const struct spa_pod *value)
 
 static int impl_node_set_io(void *object, uint32_t id, void *data, size_t size)
 {
-	return -ENOTSUP;
+	struct impl *this = object;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+
+	spa_log_debug(this->log, NAME " %p: io %d %p/%zd", this, id, data, size);
+
+	switch (id) {
+	case SPA_IO_Position:
+		this->io_position = data;
+		break;
+	default:
+		return -ENOENT;
+	}
+	return 0;
 }
 
 static int impl_node_set_param(void *object, uint32_t id, uint32_t flags,