diff --git a/src/openrct2/interface/Window.h b/src/openrct2/interface/Window.h
index 15621f1cc4..3b57e45a32 100644
--- a/src/openrct2/interface/Window.h
+++ b/src/openrct2/interface/Window.h
@@ -26,7 +26,6 @@
 
 struct rct_drawpixelinfo;
 struct rct_window;
-union rct_window_event;
 struct TrackDesignFileRef;
 struct TextInputSession;
 struct scenario_index_entry;