Index: boost/spirit/home/karma/char/char_class.hpp
===================================================================
--- boost/spirit/home/karma/char/char_class.hpp	(revision 75081)
+++ boost/spirit/home/karma/char/char_class.hpp	(working copy)
@@ -138,7 +138,7 @@
             ch = CharParam(attr);
 
             using spirit::char_class::classify;
-            return classify<char_encoding>::is(tag::space(), attr);
+            return classify<char_encoding>::is(spirit::tag::space(), attr);
         }
 
         // any_space has no attribute attached, use single space character