diff -r f9172c4625f1 -r 664052e3cf66 src/ZF/Ordinal.thy
--- a/src/ZF/Ordinal.thy	Thu Jan 12 03:01:20 1995 +0100
+++ b/src/ZF/Ordinal.thy	Thu Jan 12 03:01:40 1995 +0100
@@ -6,7 +6,7 @@
 Ordinals in Zermelo-Fraenkel Set Theory 
 *)
 
-Ordinal = WF + "simpdata" + "equalities" +
+Ordinal = WF + Bool + "simpdata" + "equalities" +
 consts
   Memrel      	:: "i=>i"
   Transset,Ord  :: "i=>o"