diff --git a/src/Chapter02.Tests/Listing02.09.Tests.cs b/src/Chapter02.Tests/Listing02.09.Tests.cs
index c1aa5993..5f35f393 100644
--- a/src/Chapter02.Tests/Listing02.09.Tests.cs
+++ b/src/Chapter02.Tests/Listing02.09.Tests.cs
@@ -1,3 +1,5 @@
+using System.Globalization;
+
 namespace AddisonWesley.Michaelis.EssentialCSharp.Chapter02.Listing02_09.Tests;
 
 [TestClass]
@@ -6,12 +8,14 @@ public class ProgramTests
     [TestMethod]
     public void Main_WriteBooleanStatements()
     {
-        string currentCultureString = 86540910.21.ToString("C");
+        var number = 86540910.21;
+        string currentCultureString = number.ToString("C");
+        string greekCultureString = number.ToString("C", CultureInfo.GetCultureInfo("el-GR"));
         string expected =
 $@"86540910.21
 {currentCultureString}
 True: {currentCultureString} == {currentCultureString}
-86.540.910,21 €";
+{greekCultureString}";
 
         IntelliTect.TestTools.Console.ConsoleAssert.Expect(
                 expected, Program.Main);
diff --git a/src/Chapter02/Listing02.09.UsingStringFormat.cs b/src/Chapter02/Listing02.09.UsingStringFormat.cs
index 8733a019..fa18afa2 100644
--- a/src/Chapter02/Listing02.09.UsingStringFormat.cs
+++ b/src/Chapter02/Listing02.09.UsingStringFormat.cs
@@ -1,5 +1,6 @@
 namespace AddisonWesley.Michaelis.EssentialCSharp.Chapter02.Listing02_09;
 
+using System;
 using System.Globalization;
 
 public class Program