diff --git a/include/boost/config/compiler/cray.hpp b/include/boost/config/compiler/cray.hpp
index 5f810781..001e3606 100644
--- a/include/boost/config/compiler/cray.hpp
+++ b/include/boost/config/compiler/cray.hpp
@@ -113,6 +113,7 @@
 #define BOOST_NO_CXX14_CONSTEXPR
 #define BOOST_HAS_LONG_LONG
 #define BOOST_HAS_FLOAT128
+#define BOOST_HASH_NO_EXTENSIONS
 
 #if __cplusplus < 201400
 #define BOOST_NO_CXX11_DECLTYPE_N3276