diff --git a/include/boost/concept_check.hpp b/include/boost/concept_check.hpp
index 97d704b..9cfd281 100644
--- a/include/boost/concept_check.hpp
+++ b/include/boost/concept_check.hpp
@@ -1050,11 +1050,11 @@ namespace boost
         c.swap(c);
       }
 
-      void const_constraints(const C& c) {
-        ci = c.begin();
-        ci = c.end();
-        n = c.size();
-        b = c.empty();
+      void const_constraints(const C& cc) {
+        ci = cc.begin();
+        ci = cc.end();
+        n = cc.size();
+        b = cc.empty();
       }
 
     private: