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-rw-r--r--Userland/Libraries/LibGUI/UndoStack.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/Userland/Libraries/LibGUI/UndoStack.h b/Userland/Libraries/LibGUI/UndoStack.h
index 5c2b829219..3f720ebd01 100644
--- a/Userland/Libraries/LibGUI/UndoStack.h
+++ b/Userland/Libraries/LibGUI/UndoStack.h
@@ -6,6 +6,7 @@
#pragma once
+#include <AK/Function.h>
#include <AK/NonnullOwnPtrVector.h>
#include <LibGUI/Forward.h>