diff --git a/common/include/fwd-window.h b/common/include/fwd-window.h
index c7816414b..89c8f4c88 100644
--- a/common/include/fwd-window.h
+++ b/common/include/fwd-window.h
@@ -27,14 +27,6 @@ namespace dcx {
 
 class window;
 
-template <typename T>
-using window_subfunction = window_event_result (*)(window *menu,const d_event &event, T *userdata);
-
-template <typename T>
-using window_subclass_subfunction = window_event_result (*)(T *menu,const d_event &event, void*);
-	
-class unused_window_userdata_t;
-
 int window_close(window *wind);
 window *window_get_front();
 window *window_get_first();
diff --git a/common/include/window.h b/common/include/window.h
index 63d4a5313..b85f393ff 100644
--- a/common/include/window.h
+++ b/common/include/window.h
@@ -26,8 +26,6 @@
 
 namespace dcx {
 
-constexpr const unused_window_userdata_t *unused_window_userdata = nullptr;
-
 class window
 {
 public:
diff --git a/common/main/game.h b/common/main/game.h
index 3d8a01aa2..164e855e5 100644
--- a/common/main/game.h
+++ b/common/main/game.h
@@ -494,7 +494,6 @@ struct game_cheats : prohibit_void_ptr<game_cheats>
 extern game_cheats cheats;
 
 game_window *game_setup();
-window_event_result game_handler(window *wind,const d_event &event, const unused_window_userdata_t *);
 window_event_result ReadControls(const d_event &event, control_info &Controls);
 bool allowed_to_fire_laser(const player_info &);
 void reset_globals_for_new_game();