diff --git a/include/boost/mpl/aux_/value_wknd.hpp b/include/boost/mpl/aux_/value_wknd.hpp
index 71c08ce..7293704 100644
--- a/include/boost/mpl/aux_/value_wknd.hpp
+++ b/include/boost/mpl/aux_/value_wknd.hpp
@@ -26,9 +26,9 @@
 
 namespace boost { namespace mpl { namespace aux {
 
-template< typename C >
+template< typename C_ >
 struct value_wknd
-    : C
+    : C_
 {
 };