diff --git a/Userland/Libraries/LibJS/Runtime/ArrayBufferPrototype.cpp b/Userland/Libraries/LibJS/Runtime/ArrayBufferPrototype.cpp
index a44701a682..997fc9d2d2 100644
--- a/Userland/Libraries/LibJS/Runtime/ArrayBufferPrototype.cpp
+++ b/Userland/Libraries/LibJS/Runtime/ArrayBufferPrototype.cpp
@@ -24,8 +24,7 @@ void ArrayBufferPrototype::initialize(GlobalObject& global_object)
     Object::initialize(global_object);
     u8 attr = Attribute::Writable | Attribute::Configurable;
     define_native_function(vm.names.slice, slice, 2, attr);
-    // FIXME: This should be an accessor property
-    define_native_property(vm.names.byteLength, byte_length_getter, {}, Attribute::Configurable);
+    define_native_accessor(vm.names.byteLength, byte_length_getter, {}, Attribute::Configurable);
 
     // 25.1.5.4 ArrayBuffer.prototype [ @@toStringTag ], https://tc39.es/ecma262/#sec-arraybuffer.prototype-@@tostringtag
     define_property(vm.well_known_symbol_to_string_tag(), js_string(vm.heap(), vm.names.ArrayBuffer.as_string()), Attribute::Configurable);