diff --git a/db/migrate/20120101000001_create_base.rb b/db/migrate/20120101000001_create_base.rb
index 88a0749fb..2e57b1d2f 100644
--- a/db/migrate/20120101000001_create_base.rb
+++ b/db/migrate/20120101000001_create_base.rb
@@ -425,7 +425,7 @@ class CreateBase < ActiveRecord::Migration
     create_table :calendars do |t|
       t.string  :name,                   limit: 250, null: true
       t.string  :timezone,               limit: 250, null: true
-      t.string  :business_hours,         limit: 1200, null: true
+      t.string  :business_hours,         limit: 3000, null: true
       t.boolean :default,                            null: false, default: false
       t.string  :ical_url,               limit: 500, null: true
       t.text    :public_holidays,        limit: 500.kilobytes + 1, null: true
diff --git a/db/migrate/20160719000001_update_calendars.rb b/db/migrate/20160719000001_update_calendars.rb
new file mode 100644
index 000000000..cf6f206c5
--- /dev/null
+++ b/db/migrate/20160719000001_update_calendars.rb
@@ -0,0 +1,9 @@
+
+class UpdateCalendars < ActiveRecord::Migration
+  def up
+    # return if it's a new setup
+    return if !Setting.find_by(name: 'system_init_done')
+
+    change_column :calendars, :business_hours, :string, limit: 3000, null: true
+  end
+end