Index: convenience.hpp
===================================================================
--- convenience.hpp	(revision 54607)
+++ convenience.hpp	(working copy)
@@ -81,7 +81,11 @@
 
     BOOST_FS_FUNC(Path) change_extension( const Path & ph,
       const BOOST_FS_TYPENAME Path::string_type & new_extension )
-      { return ph.parent_path() / (basename(ph) + new_extension); }
+    {
+      typedef BOOST_FS_TYPENAME Path::string_type string_type;
+      string_type filename = basename(ph) + new_extension;
+      return ph.parent_path() / filename;
+    }
 
 # endif