diff -r dc6be28d7f4e -r c69542757a4d src/HOL/Integ/NatBin.thy
--- a/src/HOL/Integ/NatBin.thy	Mon Aug 16 14:21:54 2004 +0200
+++ b/src/HOL/Integ/NatBin.thy	Mon Aug 16 14:22:27 2004 +0200
@@ -6,7 +6,9 @@
 
 header {* Binary arithmetic for the natural numbers *}
 
-theory NatBin = IntDiv:
+theory NatBin
+import IntDiv
+begin
 
 text {*
   Arithmetic for naturals is reduced to that for the non-negative integers.