diff --git a/src/main/scala/scalatutorial/sections/DefinitionsAndEvaluation.scala b/src/main/scala/scalatutorial/sections/DefinitionsAndEvaluation.scala
index 34258e5d..974edfdc 100644
--- a/src/main/scala/scalatutorial/sections/DefinitionsAndEvaluation.scala
+++ b/src/main/scala/scalatutorial/sections/DefinitionsAndEvaluation.scala
@@ -56,7 +56,7 @@ object DefinitionsAndEvaluation extends ScalaTutorialSection {
   def usingSquare(res0: Double): Unit = {
     def square(x: Double) = x * x
 
-    square(3.0) shouldBe res0
+    square(3.0) shouldBe 4.0
   }
 
   /**