diff --git a/include/boost/config/stdlib/sgi.hpp b/include/boost/config/stdlib/sgi.hpp
index 37c1e0c5..430092f8 100644
--- a/include/boost/config/stdlib/sgi.hpp
+++ b/include/boost/config/stdlib/sgi.hpp
@@ -41,6 +41,13 @@
 #  define BOOST_NO_STD_LOCALE
 #endif
 
+//
+// Original native SGI streams have non-standard std::messages facet:
+//
+#if defined(__sgi) && !defined(__SGI_STL_OWN_IOSTREAMS)
+#  define BOOST_NO_STD_LOCALE
+#endif
+
 //
 // No template iterator constructors, or std::allocator
 // without member templates: