diff --git a/Libraries/LibGUI/Forward.h b/Libraries/LibGUI/Forward.h
index ff0c6ba5c1..bae4920421 100644
--- a/Libraries/LibGUI/Forward.h
+++ b/Libraries/LibGUI/Forward.h
@@ -72,6 +72,8 @@ class TextDocumentLine;
 class TextDocumentUndoCommand;
 class TextEditor;
 class TreeView;
+class ToolBar;
+class ToolBarContainer;
 class Variant;
 class VerticalBoxLayout;
 class WMEvent;