diff --git a/app/controllers/calendars_controller.rb b/app/controllers/calendars_controller.rb
index 8193ef4fc..e07ba2e61 100644
--- a/app/controllers/calendars_controller.rb
+++ b/app/controllers/calendars_controller.rb
@@ -39,6 +39,7 @@ class CalendarsController < ApplicationController
     @calendar = Redmine::Helpers::Calendar.new(Date.civil(@year, @month, 1), current_language, :month)
     retrieve_query
     @query.group_by = nil
+    @query.sort_criteria = nil
     if @query.valid?
       events = []
       events += @query.issues(:include => [:tracker, :assigned_to, :priority],
diff --git a/test/functional/calendars_controller_test.rb b/test/functional/calendars_controller_test.rb
index ba0ee6c11..4454ad4cb 100644
--- a/test/functional/calendars_controller_test.rb
+++ b/test/functional/calendars_controller_test.rb
@@ -29,7 +29,8 @@ class CalendarsControllerTest < Redmine::ControllerTest
            :issue_statuses,
            :issue_relations,
            :issue_categories,
-           :enumerations
+           :enumerations,
+           :queries
 
   def test_show
     get :show, :params => {
@@ -94,4 +95,22 @@ class CalendarsControllerTest < Redmine::ControllerTest
       assert_select 'td.even', :text => '10'
     end
   end
+
+  def test_show_custom_query_with_multiple_sort_criteria
+    get :show, :params => {
+        :query_id => 5
+      }
+
+    assert_response :success
+    assert_select 'h2', :text => 'Open issues by priority and tracker'
+  end
+
+  def test_show_custom_query_with_group_by_option
+    get :show, :params => {
+        :query_id => 6
+      }
+      
+    assert_response :success
+    assert_select 'h2', :text => 'Open issues grouped by tracker'
+  end
 end