diff -r 0b0df6c8646a -r 43c718438f9f src/HOL/Library/Quotient.thy
--- a/src/HOL/Library/Quotient.thy	Mon Dec 10 11:24:08 2007 +0100
+++ b/src/HOL/Library/Quotient.thy	Mon Dec 10 11:24:09 2007 +0100
@@ -6,7 +6,7 @@
 header {* Quotient types *}
 
 theory Quotient
-imports Main
+imports PreList Hilbert_Choice
 begin
 
 text {*