diff --git a/src/Chapter23/Listing23.05.DeclaringTypesFromUnmanagedStructs.cs b/src/Chapter23/Listing23.05.DeclaringTypesFromUnmanagedStructs.cs
index 9908f7ea..7759c600 100644
--- a/src/Chapter23/Listing23.05.DeclaringTypesFromUnmanagedStructs.cs
+++ b/src/Chapter23/Listing23.05.DeclaringTypesFromUnmanagedStructs.cs
@@ -12,9 +12,9 @@ struct ColorRef
         public byte Green;
         public byte Blue;
         // Turn off the warning about not accessing Unused
-#pragma warning disable 414
+    #pragma warning disable 414
         private byte Unused;
-#pragma warning restore 414
+    #pragma warning restore 414
 
         public ColorRef(byte red, byte green, byte blue)
         {