1 files changed, 2 insertions, 2 deletions
diff --git a/Libraries/LibGUI/UndoStack.h b/Libraries/LibGUI/UndoStack.h
index 2abc278d21..e93de4ae02 100644
--- a/Libraries/LibGUI/UndoStack.h
+++ b/Libraries/LibGUI/UndoStack.h
@@ -52,8 +52,8 @@ private:
     };
 
     NonnullOwnPtrVector<UndoCommandsContainer> m_stack;
-    int m_stack_index { 0 };
-    int m_last_updated_undo_vector_size { 0 };
+    size_t m_stack_index { 0 };
+    size_t m_last_updated_undo_vector_size { 0 };
 };
 
 }