diff --git a/include/godot_cpp/classes/wrapped.hpp b/include/godot_cpp/classes/wrapped.hpp
index fbab055..17a742c 100644
--- a/include/godot_cpp/classes/wrapped.hpp
+++ b/include/godot_cpp/classes/wrapped.hpp
@@ -41,6 +41,8 @@
 
 namespace godot {
 
+class ClassDB;
+
 typedef void GodotObject;
 
 // Base for all engine classes, to contain the pointer to the engine instance.