diff -r bc7982c54e37 -r d323e7773aa8 src/HOL/Complex.thy
--- a/src/HOL/Complex.thy	Mon Apr 26 11:34:19 2010 +0200
+++ b/src/HOL/Complex.thy	Mon Apr 26 15:37:50 2010 +0200
@@ -99,7 +99,7 @@
 
 subsection {* Multiplication and Division *}
 
-instantiation complex :: "{field, division_ring_inverse_zero}"
+instantiation complex :: field_inverse_zero
 begin
 
 definition