diff --git a/servers/audio_server.cpp b/servers/audio_server.cpp
index fead2f54dae..d36057b4659 100644
--- a/servers/audio_server.cpp
+++ b/servers/audio_server.cpp
@@ -1297,6 +1297,7 @@ void AudioServer::_bind_methods() {
 	ADD_SIGNAL(MethodInfo("bus_layout_changed"));
 
 	BIND_ENUM_CONSTANT(SPEAKER_MODE_STEREO);
+	BIND_ENUM_CONSTANT(SPEAKER_SURROUND_31);
 	BIND_ENUM_CONSTANT(SPEAKER_SURROUND_51);
 	BIND_ENUM_CONSTANT(SPEAKER_SURROUND_71);
 }