diff --git a/include/fc/crypto/sha256.hpp b/include/fc/crypto/sha256.hpp
index 0adc2ac..33a2bfc 100644
--- a/include/fc/crypto/sha256.hpp
+++ b/include/fc/crypto/sha256.hpp
@@ -3,7 +3,6 @@
 #include <fc/string.hpp>
 #include <fc/platform_independence.hpp>
 #include <fc/io/raw_fwd.hpp>
-#include <boost/functional/hash.hpp>
 
 namespace fc
 {
@@ -134,17 +133,5 @@ namespace std
     };
 }
 
-namespace boost
-{
-    template<>
-    struct hash<fc::sha256>
-    {
-       size_t operator()( const fc::sha256& s )const
-       {
-           return  s._hash[3];// *((size_t*)&s);
-       }
-    };
-}
-
 #include <fc/reflect/reflect.hpp>
 FC_REFLECT_TYPENAME( fc::sha256 )