Index: mirrors.cgi
===================================================================
--- mirrors.cgi	(revision 1135864)
+++ mirrors.cgi	(working copy)
@@ -91,11 +91,11 @@
       break
 
   # Check if the requested Preferred mirror is in the list
-  # Note the user-requested mirror doesn't have a trailing-slash
+  # Note the user-requested mirror may have no trailing-slash
   prefmir=None
   if preferred:
     for mir in mirrors:
-      if mir[2][:-1]==preferred:
+      if mir[2].startswith(preferred):
         prefmir=mir
         break
   # Otherwise pick a preferred mirror from our country