diff --git a/src/DotVVM.Framework/Compilation/Javascript/JsFormattingVisitor.cs b/src/DotVVM.Framework/Compilation/Javascript/JsFormattingVisitor.cs
index 34adb5ed64..48d2e6bb52 100644
--- a/src/DotVVM.Framework/Compilation/Javascript/JsFormattingVisitor.cs
+++ b/src/DotVVM.Framework/Compilation/Javascript/JsFormattingVisitor.cs
@@ -106,8 +106,7 @@ public override string ToString()
 
         public string GetParameterlessResult()
         {
-            if (parameters != null) throw new InvalidOperationException($"The script contains parameters: `{ToString()}`.");
-            return result.ToString();
+            return GetResult(OperatorPrecedence.Max).ToDefaultString();
         }
 
         public ParametrizedCode GetResult(OperatorPrecedence operatorPrecedence)
diff --git a/src/DotVVM.Framework/Controls/KnockoutHelper.cs b/src/DotVVM.Framework/Controls/KnockoutHelper.cs
index d60056c77a..53a5618f0f 100644
--- a/src/DotVVM.Framework/Controls/KnockoutHelper.cs
+++ b/src/DotVVM.Framework/Controls/KnockoutHelper.cs
@@ -267,10 +267,14 @@ private static JsExpression TransformOptionValueToExpression(DotvvmBindableObjec
         {
             switch (optionValue)
             {
-                case IValueBinding binding:
-                    return new JsIdentifierExpression(
-                        JavascriptTranslator.FormatKnockoutScript(binding.GetParametrizedKnockoutExpression(handler, unwrapped: true),
-                            new ParametrizedCode("c"), new ParametrizedCode("d")));
+                case IValueBinding binding: {
+                    var adjustedCode = binding.GetParametrizedKnockoutExpression(handler, unwrapped: true).AssignParameters(o =>
+                        o == JavascriptTranslator.KnockoutContextParameter ? new ParametrizedCode("c") :
+                        o == JavascriptTranslator.KnockoutViewModelParameter ? new ParametrizedCode("d") :
+                        default(CodeParameterAssignment)
+                    );
+                    return new JsSymbolicParameter(new CodeSymbolicParameter("tmp symbol", defaultAssignment: adjustedCode));
+                }
                 case IStaticValueBinding staticValueBinding:
                     return new JsLiteral(staticValueBinding.Evaluate(handler));
                 case JsExpression expression: