diff --git a/include/boost/concept_check.hpp b/include/boost/concept_check.hpp
index 58bd8b2..a6b5d20 100644
--- a/include/boost/concept_check.hpp
+++ b/include/boost/concept_check.hpp
@@ -72,6 +72,7 @@ namespace boost
       T x;
   };
 
+  template <> struct Integer<char> {};
   template <> struct Integer<signed char> {};
   template <> struct Integer<unsigned char> {};
   template <> struct Integer<short> {};