diff --git a/Userland/Libraries/LibGUI/Forward.h b/Userland/Libraries/LibGUI/Forward.h
index c80ce54c22..2a11e53283 100644
--- a/Userland/Libraries/LibGUI/Forward.h
+++ b/Userland/Libraries/LibGUI/Forward.h
@@ -23,6 +23,7 @@ class CheckBox;
 class ComboBox;
 class Command;
 class CommandPalette;
+class Dialog;
 class DialogButton;
 class DragEvent;
 class DropEvent;