diff -r 051f544170fe -r cbce1fd3b1b7 lib/redmine/helpers/.svn/text-base/calendar.rb.svn-base
--- a/lib/redmine/helpers/.svn/text-base/calendar.rb.svn-base
+++ b/lib/redmine/helpers/.svn/text-base/calendar.rb.svn-base
@@ -68,6 +68,8 @@
         case Setting.start_of_week.to_i
         when 1
           @first_dow ||= (1 - 1)%7 + 1
+        when 6
+          @first_dow ||= (6 - 1)%7 + 1
         when 7
           @first_dow ||= (7 - 1)%7 + 1
         else