diff --git a/Libraries/LibJS/Runtime/Array.h b/Libraries/LibJS/Runtime/Array.h
index 6ae77de113b..e30df2335e5 100644
--- a/Libraries/LibJS/Runtime/Array.h
+++ b/Libraries/LibJS/Runtime/Array.h
@@ -58,11 +58,16 @@ protected:
     explicit Array(Object& prototype);
 
 private:
+    virtual bool is_array_exotic_object() const final { return true; }
+
     ThrowCompletionOr<bool> set_length(PropertyDescriptor const&);
 
     bool m_length_writable { true };
 };
 
+template<>
+inline bool Object::fast_is<Array>() const { return is_array_exotic_object(); }
+
 enum class Holes {
     SkipHoles,
     ReadThroughHoles,
diff --git a/Libraries/LibJS/Runtime/Object.h b/Libraries/LibJS/Runtime/Object.h
index 34fce27b8f0..0225c30d7cf 100644
--- a/Libraries/LibJS/Runtime/Object.h
+++ b/Libraries/LibJS/Runtime/Object.h
@@ -198,6 +198,7 @@ public:
     virtual bool is_regexp_object() const { return false; }
     virtual bool is_bigint_object() const { return false; }
     virtual bool is_string_object() const { return false; }
+    virtual bool is_array_exotic_object() const { return false; }
     virtual bool is_global_object() const { return false; }
     virtual bool is_proxy_object() const { return false; }
     virtual bool is_native_function() const { return false; }