diff --git a/Userland/Libraries/LibWeb/CodeGenerators/WrapperGenerator.cpp b/Userland/Libraries/LibWeb/CodeGenerators/WrapperGenerator.cpp
index 3c4ab96c0e..f96a054e98 100644
--- a/Userland/Libraries/LibWeb/CodeGenerators/WrapperGenerator.cpp
+++ b/Userland/Libraries/LibWeb/CodeGenerators/WrapperGenerator.cpp
@@ -768,6 +768,11 @@ public:
     if (interface.extended_attributes.contains("CustomGet")) {
         generator.append(R"~~~(
     virtual JS::Value get(const JS::PropertyName&, JS::Value receiver = {}, bool without_side_effects = false) const override;
+)~~~");
+    }
+    if (interface.extended_attributes.contains("CustomGetByIndex")) {
+        generator.append(R"~~~(
+    virtual JS::Value get_by_index(u32 property_index) const override;
 )~~~");
     }
     if (interface.extended_attributes.contains("CustomPut")) {