diff --git a/_includes/tutorial/reactivity-overview.md b/_includes/tutorial/reactivity-overview.md
index b181993bf..53fecde83 100644
--- a/_includes/tutorial/reactivity-overview.md
+++ b/_includes/tutorial/reactivity-overview.md
@@ -122,7 +122,7 @@ shinyServer(function(input, output) {
     fib(as.numeric(input$n))
   }
 
-  output$nthValue <- renderText({ currentFib })
+  output$nthValue <- renderText({ currentFib() })
 })
 {% endhighlight %}