diff -r a8ed41b6280b -r c4d337782de4 src/HOL/ROOT
--- a/src/HOL/ROOT	Sat Jul 21 21:16:08 2012 +0200
+++ b/src/HOL/ROOT	Sat Jul 21 22:13:50 2012 +0200
@@ -21,7 +21,7 @@
 
 session "HOL-Proofs"! (2) in "." = Pure +
   description {* HOL-Main with proof terms *}
-  options [document = false, proofs = 2, parallel_proofs = false]
+  options [document = false, proofs = 2, parallel_proofs = 0]
   theories Main
 
 session HOLCF! (3) = HOL +