diff --git a/include/boost/config/compiler/visualc.hpp b/include/boost/config/compiler/visualc.hpp
index 0b11faaf..aa4584df 100644
--- a/include/boost/config/compiler/visualc.hpp
+++ b/include/boost/config/compiler/visualc.hpp
@@ -183,6 +183,16 @@
 #  define BOOST_NO_RTTI
 #endif
 
+//
+// TR1 features:
+//
+#if _MSC_VER >= 1700
+// # define BOOST_HAS_TR1_HASH			// don't know if this is true yet.
+// # define BOOST_HAS_TR1_TYPE_TRAITS	// don't know if this is true yet.
+# define BOOST_HAS_TR1_UNORDERED_MAP
+# define BOOST_HAS_TR1_UNORDERED_SET
+#endif
+
 //
 // C++0x features
 //