diff --git a/05-Considering_Maintainability.md b/05-Considering_Maintainability.md
index 3116412..402a08a 100644
--- a/05-Considering_Maintainability.md
+++ b/05-Considering_Maintainability.md
@@ -16,7 +16,7 @@ namespace my_project {
     // if the above macro would be expanded, then the following line would be:
     //   static const double 3.14159 = 3.14159;
     // which leads to a compile-time error. Sometimes such errors are hard to understand.
-    static const double PI = 3.14159;
+    static constexpr double PI = 3.14159;
   };
 }
 ```