diff --git a/addons/web/static/src/js/fields/field_utils.js b/addons/web/static/src/js/fields/field_utils.js
index ac4c06454ea..0a44a52e315 100644
--- a/addons/web/static/src/js/fields/field_utils.js
+++ b/addons/web/static/src/js/fields/field_utils.js
@@ -29,12 +29,20 @@ var _t = core._t;
 /**
  * @todo Really? it returns a jqueryElement...  We should try to move this to a
  * module with dom helpers functions, such as web.dom, maybe. And replace this
- * with a function that returns a string
+ * with a function that returns a string so we can get rid of the forceString.
  *
  * @param {boolean} value
- * @returns {jQueryElement}
+ * @param {Object} [field]
+ *        a description of the field (note: this parameter is ignored)
+ * @param {Object} [options] additional options
+ * @param {boolean} [options.forceString=false] if true, returns a string
+*    representation of the boolean rather than a jQueryElement
+ * @returns {jQueryElement | string}
  */
-function formatBoolean(value) {
+function formatBoolean(value, field, options) {
+    if (options && options.forceString) {
+        return value ? _t('True') : _t('False');
+    }
     var $input = $('<input/>', {
         type: 'checkbox',
     }).prop({
diff --git a/addons/web/static/src/js/views/calendar/calendar_renderer.js b/addons/web/static/src/js/views/calendar/calendar_renderer.js
index a4930c87d37..b61236131c6 100644
--- a/addons/web/static/src/js/views/calendar/calendar_renderer.js
+++ b/addons/web/static/src/js/views/calendar/calendar_renderer.js
@@ -288,7 +288,7 @@ return AbstractRenderer.extend({
         if (field.type === "one2many" || field.type === "many2many") {
             return field_utils.format[field.type]({data: record[fieldName]}, field);
         } else {
-            return field_utils.format[field.type](record[fieldName], field);
+            return field_utils.format[field.type](record[fieldName], field, {forceString: true});
         }
     },
     /**
diff --git a/addons/web/static/tests/views/calendar_tests.js b/addons/web/static/tests/views/calendar_tests.js
index 21e4e8c26a7..dfc42c6f746 100644
--- a/addons/web/static/tests/views/calendar_tests.js
+++ b/addons/web/static/tests/views/calendar_tests.js
@@ -433,6 +433,7 @@ QUnit.module('Views', {
                 'readonly_form_view_id="1">'+
                     '<field name="name"/>'+
                     '<field name="start"/>'+
+                    '<field name="allday"/>'+
             '</calendar>',
             archs: archs,
             viewOptions: {
@@ -480,8 +481,8 @@ QUnit.module('Views', {
         $('.modal button.btn:contains(Create)').trigger('click');
         var $newevent = calendar.$('.fc-event:contains(new event)');
 
-        assert.strictEqual($newevent.text().replace(/[\s\n\r]+/g, ''), "08:00-10:00newevent12/13/201608:00:00",
-            "should display the new event with time and title");
+        assert.strictEqual($newevent.text().replace(/[\s\n\r]+/g, ''), "08:00-10:00newevent12/13/201608:00:00False",
+            "should display the new event with time, title and additional fields");
 
         assert.deepEqual($newevent.data('fcSeg').event.record,
             {