diff --git a/Userland/Libraries/LibJS/Heap/Cell.h b/Userland/Libraries/LibJS/Heap/Cell.h
index 94d219e181..549d06c356 100644
--- a/Userland/Libraries/LibJS/Heap/Cell.h
+++ b/Userland/Libraries/LibJS/Heap/Cell.h
@@ -98,7 +98,7 @@ protected:
 
 private:
     bool m_mark : 1 { false };
-    bool m_overrides_must_survive_garbage_collection { false };
+    bool m_overrides_must_survive_garbage_collection : 1 { false };
     State m_state : 1 { State::Live };
 };