diff --git a/src/main/scala/stdlib/TypeSignatures.scala b/src/main/scala/stdlib/TypeSignatures.scala
index b5df2a64..c7ea879d 100644
--- a/src/main/scala/stdlib/TypeSignatures.scala
+++ b/src/main/scala/stdlib/TypeSignatures.scala
@@ -50,7 +50,7 @@ object TypeSignatures extends FlatSpec with Matchers with exercise.Section {
     */
   def deriveMetaInformationTypeSignatures(res0: Boolean, res1: String, res2: String) {
     val zoom = "zoom"
-    zoom.getClass should be(classOf[String])
+    zoom.isInstanceOf[String] should be(res0)
     zoom.getClass.getCanonicalName should be(res1)
     zoom.getClass.getSimpleName should be(res2)
   }