diff --git a/src/Chapter04.Tests/Listing04.24.Tests.cs b/src/Chapter04.Tests/Listing04.24.Tests.cs
index cfd1b5f2e..979a54c6b 100644
--- a/src/Chapter04.Tests/Listing04.24.Tests.cs
+++ b/src/Chapter04.Tests/Listing04.24.Tests.cs
@@ -6,13 +6,13 @@ namespace AddisonWesley.Michaelis.EssentialCSharp.Chapter04.Listing04_24.Tests;
 public class ProgramTests
 {
     [TestMethod]
-    public void Main_Input8_ExitProgram()
+    public void Main_InputNegative1_ExitProgram()
     {
         const string expected =
             "Exiting";
 
         ConsoleAssert.Expect(
-            expected, ()=>Program.Main("8"));
+            expected, ()=>Program.Main("-1"));
     }
 
     [TestMethod]
@@ -24,4 +24,14 @@ public void Main_Input10_ProgramDoesNotExit()
         ConsoleAssert.Expect(
             expected, ()=>Program.Main("10"));
     }
+
+    [TestMethod]
+    public void Main_Input0_ProgramDoesNotExit()
+    {
+        const string expected =
+            "";
+
+        ConsoleAssert.Expect(
+            expected, () => Program.Main("0"));
+    }
 }
diff --git a/src/Chapter04/Listing04.24.NoCodeBlock.cs b/src/Chapter04/Listing04.24.NoCodeBlock.cs
index 395bef295..4c9b08912 100644
--- a/src/Chapter04/Listing04.24.NoCodeBlock.cs
+++ b/src/Chapter04/Listing04.24.NoCodeBlock.cs
@@ -7,10 +7,10 @@ public static void Main(params string[] args)
         int input = int.Parse(args[0]);
 
         #region INCLUDE
-        if (input < 9)
+        if (input < 0)
             #region HIGHLIGHT
             Console.WriteLine("Exiting");
-        #endregion HIGHLIGHT
+            #endregion HIGHLIGHT
         #endregion INCLUDE
     }
 }