diff --git a/modules/gdscript/register_types.cpp b/modules/gdscript/register_types.cpp
index a7b342723e..4d86e22d8f 100644
--- a/modules/gdscript/register_types.cpp
+++ b/modules/gdscript/register_types.cpp
@@ -137,6 +137,7 @@ static void _editor_init() {
 void initialize_gdscript_module(ModuleInitializationLevel p_level) {
 	if (p_level == MODULE_INITIALIZATION_LEVEL_SERVERS) {
 		GDREGISTER_CLASS(GDScript);
+		GDREGISTER_INTERNAL_CLASS(GDScriptFunctionState);
 
 		script_language_gd = memnew(GDScriptLanguage);
 		ScriptServer::register_language(script_language_gd);