diff --git a/src/main/scala/introprog/examples/TestIO.scala b/src/main/scala/introprog/examples/TestIO.scala
index 73c0237..353a084 100644
--- a/src/main/scala/introprog/examples/TestIO.scala
+++ b/src/main/scala/introprog/examples/TestIO.scala
@@ -21,10 +21,10 @@ object TestIO {
     assert(isSameContents, s"$highscores != $highscores2")
     println(s"$highscores == $highscores2\n$testResult")
 
-    testImageLoadAndDraw
+    testImageLoadAndDraw()
   }
 
-  def testImageLoadAndDraw : Unit = {
+  def testImageLoadAndDraw(): Unit = {
     import introprog.*
     import java.awt.Color
     import java.awt.Color.*