diff --git a/libstdc++/stl/ChangeLog b/libstdc++/stl/ChangeLog
index 87f26c48e18..5e2240b5edd 100644
--- a/libstdc++/stl/ChangeLog
+++ b/libstdc++/stl/ChangeLog
@@ -1,3 +1,7 @@
+1999-01-20  Mark Mitchell  <mark@markmitchell.com>
+
+	* stl_config.h (__STL_USE_NAMESPACES): Define.
+
 1998-11-27  Alexandre Oliva  <oliva@dcc.unicamp.br>
 
 	* bitset: explicitly convert basic_string<...>::npos to size_t in
diff --git a/libstdc++/stl/stl_config.h b/libstdc++/stl/stl_config.h
index 31efbf8731f..6e46ebd3d4e 100644
--- a/libstdc++/stl/stl_config.h
+++ b/libstdc++/stl/stl_config.h
@@ -160,6 +160,7 @@
 #     define __STL_HAS_NAMESPACES
 #     define __STL_NO_NAMESPACES
 #     define __SGI_STL_USE_AUTO_PTR_CONVERSIONS
+#     define __STL_USE_NAMESPACES
 #   endif
     /* glibc pre 2.0 is very buggy. We have to disable thread for it.
        It should be upgraded to glibc 2.0 or later. */