diff --git a/Meta/Lagom/Tools/CodeGenerators/LibWeb/BindingsGenerator/IDLGenerators.cpp b/Meta/Lagom/Tools/CodeGenerators/LibWeb/BindingsGenerator/IDLGenerators.cpp
index 7520644e77b..5add1d4281b 100644
--- a/Meta/Lagom/Tools/CodeGenerators/LibWeb/BindingsGenerator/IDLGenerators.cpp
+++ b/Meta/Lagom/Tools/CodeGenerators/LibWeb/BindingsGenerator/IDLGenerators.cpp
@@ -189,8 +189,6 @@ static bool is_nullable_frozen_array_of_single_type(Type const& type, StringView
     return parameters.first()->name() == type_name;
 }
 
-CppType idl_type_name_to_cpp_type(Type const& type, Interface const& interface);
-
 static ByteString union_type_to_variant(UnionType const& union_type, Interface const& interface)
 {
     StringBuilder builder;