diff -r 35807a5d8dc2 -r 2a1953f0d20d src/HOL/Library/Cardinality.thy
--- a/src/HOL/Library/Cardinality.thy	Sat Mar 24 16:27:04 2012 +0100
+++ b/src/HOL/Library/Cardinality.thy	Sun Mar 25 20:15:39 2012 +0200
@@ -5,7 +5,7 @@
 header {* Cardinality of types *}
 
 theory Cardinality
-imports Main
+imports "~~/src/HOL/Main"
 begin
 
 subsection {* Preliminary lemmas *}