diff --git a/CppCoreGuidelines.md b/CppCoreGuidelines.md
index 1f561d6..d955d9e 100644
--- a/CppCoreGuidelines.md
+++ b/CppCoreGuidelines.md
@@ -15519,8 +15519,8 @@ Avoid code bloat.
 It could be a base class:
 
     struct Link_base {   // stable
-        Link* suc;
-        Link* pre;
+        Link_base* suc;
+        Link_base* pre;
     };
 
     template<typename T>   // templated wrapper to add type safety