diff --git a/src/modules/module-protocol-pulse/module.c b/src/modules/module-protocol-pulse/module.c
index b2fd4f6ca..2627db29d 100644
--- a/src/modules/module-protocol-pulse/module.c
+++ b/src/modules/module-protocol-pulse/module.c
@@ -174,6 +174,7 @@ int module_args_to_audioinfo(struct impl *impl, struct pw_properties *props, str
 
 	/* We don't use any incoming format setting and use our native format */
 	spa_zero(*info);
+	info->flags = SPA_AUDIO_FLAG_UNPOSITIONED;
 	info->format = SPA_AUDIO_FORMAT_F32P;
 
 	if ((str = pw_properties_get(props, "channels")) != NULL) {
@@ -199,6 +200,7 @@ int module_args_to_audioinfo(struct impl *impl, struct pw_properties *props, str
 			return -EINVAL;
 		}
 		channel_map_to_positions(&map, info->position);
+		info->flags &= ~SPA_AUDIO_FLAG_UNPOSITIONED;
 		pw_properties_set(props, "channel_map", NULL);
 	} else {
 		if (info->channels == 0)
@@ -216,6 +218,8 @@ int module_args_to_audioinfo(struct impl *impl, struct pw_properties *props, str
 			for (i = 0; i < info->channels; i++)
 				info->position[i] = SPA_AUDIO_CHANNEL_UNKNOWN;
 		}
+		if (info->position[0] != SPA_AUDIO_CHANNEL_UNKNOWN)
+			info->flags &= ~SPA_AUDIO_FLAG_UNPOSITIONED;
 	}
 
 	if ((str = pw_properties_get(props, "rate")) != NULL) {
diff --git a/src/modules/module-protocol-pulse/modules/module-loopback.c b/src/modules/module-protocol-pulse/modules/module-loopback.c
index 11cb88ec0..64c6fd106 100644
--- a/src/modules/module-protocol-pulse/modules/module-loopback.c
+++ b/src/modules/module-protocol-pulse/modules/module-loopback.c
@@ -63,15 +63,23 @@ static int module_loopback_load(struct client *client, struct module *module)
 	struct module_loopback_data *data = module->user_data;
 	FILE *f;
 	char *args;
-	size_t size;
+	size_t size, i;
 
 	pw_properties_setf(data->capture_props, PW_KEY_NODE_GROUP, "loopback-%u", module->idx);
 	pw_properties_setf(data->playback_props, PW_KEY_NODE_GROUP, "loopback-%u", module->idx);
 
 	f = open_memstream(&args, &size);
 	fprintf(f, "{");
-	if (data->info.channels != 0)
+	if (data->info.channels != 0) {
 		fprintf(f, " audio.channels = %u", data->info.channels);
+		if (!(data->info.flags & SPA_AUDIO_FLAG_UNPOSITIONED)) {
+			fprintf(f, " audio.position = [ ");
+			for (i = 0; i < data->info.channels; i++)
+				fprintf(f, "%s%s", i == 0 ? "" : ",",
+					channel_id2name(data->info.position[i]));
+			fprintf(f, " ]");
+		}
+	}
 	fprintf(f, " capture.props = {");
 	pw_properties_serialize_dict(f, &data->capture_props->dict, 0);
 	fprintf(f, " } playback.props = {");