diff --git a/Userland/Libraries/LibGUI/Forward.h b/Userland/Libraries/LibGUI/Forward.h
index 28208c1457..7e9e2948cd 100644
--- a/Userland/Libraries/LibGUI/Forward.h
+++ b/Userland/Libraries/LibGUI/Forward.h
@@ -39,6 +39,7 @@ class AutocompleteProvider;
 class BoxLayout;
 class Button;
 class CheckBox;
+class ComboBox;
 class Command;
 class DragEvent;
 class DropEvent;
@@ -68,6 +69,7 @@ class MultiView;
 class OpacitySlider;
 class PaintEvent;
 class Painter;
+class RadioButton;
 class ResizeCorner;
 class ResizeEvent;
 class ScrollBar;