diff --git a/src/window_gui.h b/src/window_gui.h
--- a/src/window_gui.h
+++ b/src/window_gui.h
@@ -815,7 +815,6 @@ extern SpecialMouseMode _special_mouse_m
 Window *GetCallbackWnd();
 
 void SetFocusedWindow(Window *w);
-bool EditBoxInGlobalFocus();
 
 void ScrollbarClickHandler(Window *w, NWidgetCore *nw, int x, int y);