diff --git a/servers/audio_server.cpp b/servers/audio_server.cpp
index 511a8b3122fc..f1848b0b9456 100644
--- a/servers/audio_server.cpp
+++ b/servers/audio_server.cpp
@@ -1147,6 +1147,7 @@ void AudioServer::start_playback_stream(Ref<AudioStreamPlayback> p_playback, Has
 		for (int channel_idx = 0; channel_idx < MAX_CHANNELS_PER_BUS; channel_idx++) {
 			new_bus_details->volume[idx][channel_idx] = pair.value[channel_idx];
 		}
+		idx++;
 	}
 	playback_node->bus_details = new_bus_details;
 	playback_node->prev_bus_details = new AudioStreamPlaybackBusDetails();