diff -r 6061ae1f90f2 -r 9bc16273c2d4 src/HOL/Auth/Guard/Extensions.thy
--- a/src/HOL/Auth/Guard/Extensions.thy	Fri Jun 17 11:35:35 2005 +0200
+++ b/src/HOL/Auth/Guard/Extensions.thy	Fri Jun 17 16:12:49 2005 +0200
@@ -11,7 +11,7 @@
 
 header {*Extensions to Standard Theories*}
 
-theory Extensions = Event:
+theory Extensions imports Event begin
 
 subsection{*Extensions to Theory @{text Set}*}