diff --git a/ets2panda/compiler/lowering/ets/objectLiteralLowering.cpp b/ets2panda/compiler/lowering/ets/objectLiteralLowering.cpp
index d0f415917df8b09997b5b5bff31639751f60d695..031e672607510915ded2af816de69b6c4031d67c 100644
--- a/ets2panda/compiler/lowering/ets/objectLiteralLowering.cpp
+++ b/ets2panda/compiler/lowering/ets/objectLiteralLowering.cpp
@@ -186,7 +186,7 @@ static void GenerateNewStatements(public_lib::Context *ctx, ir::ObjectExpression
         checker::Signature *sig = classType->ConstructSignatures().front();
         for (auto param : sig->Params()) {
             ES2PANDA_ASSERT(param->Declaration() != nullptr);
-            ctorArgumentsMap.emplace(param->Declaration()->Name(), nullptr);
+            ctorArgumentsMap.emplace(param->Declaration()->Name(), allocator->New<ir::UndefinedLiteral>());
         }
     }