diff --git a/lib/src/renderer.dart b/lib/src/renderer.dart
index 3517d22..86f0308 100644
--- a/lib/src/renderer.dart
+++ b/lib/src/renderer.dart
@@ -91,7 +91,8 @@
 
     if (value is Function) {
       var context = new LambdaContext(node, this);
-      value = value(context);
+      Function valueFunction = value;
+      value = valueFunction(context);
       context.close();
     }