diff -r 2733b240bfea -r d3ff367a16a0 src/Pure/General/path.ML
--- a/src/Pure/General/path.ML	Sat Apr 02 20:33:34 2016 +0200
+++ b/src/Pure/General/path.ML	Sat Apr 02 21:10:07 2016 +0200
@@ -173,7 +173,7 @@
 
 val print = Pretty.unformatted_string_of o pretty;
 
-val _ = PolyML.addPrettyPrinter (fn _ => fn _ => Pretty.to_polyml o pretty);
+val _ = ML_system_pp (fn _ => fn _ => Pretty.to_polyml o pretty);
 
 
 (* base element *)