diff --git a/Userland/Applications/Spreadsheet/Spreadsheet.h b/Userland/Applications/Spreadsheet/Spreadsheet.h
index 207571e3443..20f0f36a017 100644
--- a/Userland/Applications/Spreadsheet/Spreadsheet.h
+++ b/Userland/Applications/Spreadsheet/Spreadsheet.h
@@ -155,7 +155,7 @@ private:
     HashTable<Position> m_selected_cells;
 
     Workbook& m_workbook;
-    mutable SheetGlobalObject* m_global_object;
+    mutable JS::GCPtr<SheetGlobalObject> m_global_object;
 
     NonnullOwnPtr<JS::Interpreter> m_interpreter;
 
diff --git a/Userland/Applications/Spreadsheet/Workbook.h b/Userland/Applications/Spreadsheet/Workbook.h
index acd9e516f77..3e87d8d1641 100644
--- a/Userland/Applications/Spreadsheet/Workbook.h
+++ b/Userland/Applications/Spreadsheet/Workbook.h
@@ -46,7 +46,7 @@ private:
     NonnullRefPtr<JS::VM> m_vm;
     NonnullOwnPtr<JS::Interpreter> m_interpreter;
     JS::VM::InterpreterExecutionScope m_interpreter_scope;
-    WorkbookObject* m_workbook_object { nullptr };
+    JS::GCPtr<WorkbookObject> m_workbook_object;
     JS::ExecutionContext m_main_execution_context;
     GUI::Window& m_parent_window;