diff --git a/CppCoreGuidelines.md b/CppCoreGuidelines.md
index 7beb002..37451e3 100644
--- a/CppCoreGuidelines.md
+++ b/CppCoreGuidelines.md
@@ -9156,7 +9156,7 @@ Convenience of use and avoidance of errors.
 
 ##### Example
 
-    enum Day { mon, tue, wed, thu, fri, sat, sun };
+    enum class Day { mon, tue, wed, thu, fri, sat, sun };
 
     Day& operator++(Day& d)
     {