diff --git a/Libraries/LibJS/Runtime/GlobalObject.cpp b/Libraries/LibJS/Runtime/GlobalObject.cpp
index db8bda0962..c4a52a6a80 100644
--- a/Libraries/LibJS/Runtime/GlobalObject.cpp
+++ b/Libraries/LibJS/Runtime/GlobalObject.cpp
@@ -75,6 +75,8 @@ GlobalObject::GlobalObject()
 
 void GlobalObject::initialize()
 {
+    ensure_shape_is_unique();
+
     // These are done first since other prototypes depend on their presence.
     m_empty_object_shape = heap().allocate<Shape>(*this, *this);
     m_object_prototype = heap().allocate_without_global_object<ObjectPrototype>(*this);
diff --git a/Libraries/LibJS/Runtime/Object.h b/Libraries/LibJS/Runtime/Object.h
index e8e4b78301..7f55582258 100644
--- a/Libraries/LibJS/Runtime/Object.h
+++ b/Libraries/LibJS/Runtime/Object.h
@@ -149,6 +149,8 @@ public:
 
     Value invoke(const StringOrSymbol& property_name, Optional<MarkedValueList> arguments = {});
 
+    void ensure_shape_is_unique();
+
 protected:
     enum class GlobalObjectTag { Tag };
     enum class ConstructWithoutPrototypeTag { Tag };
@@ -165,7 +167,6 @@ private:
     void call_native_property_setter(Object* this_object, Value property, Value) const;
 
     void set_shape(Shape&);
-    void ensure_shape_is_unique();
 
     bool m_is_extensible { true };
     Shape* m_shape { nullptr };