--- a/src/HOL/Library/SetsAndFunctions.thy	Fri Mar 27 09:58:48 2009 +0100
+++ b/src/HOL/Library/SetsAndFunctions.thy	Fri Mar 27 10:12:55 2009 +0100
@@ -5,7 +5,7 @@
 header {* Operations on sets and functions *}
 
 theory SetsAndFunctions
-imports Plain
+imports Main
 begin
 
 text {*