diff --git a/ui/ui.datepicker.js b/ui/ui.datepicker.js
index a2bc36623..295fd0aba 100644
--- a/ui/ui.datepicker.js
+++ b/ui/ui.datepicker.js
@@ -84,7 +84,7 @@ function Datepicker() {
 			// string value starting with '+' for current year + value
 		minDate: null, // The earliest selectable date, or null for no limit
 		maxDate: null, // The latest selectable date, or null for no limit
-		duration: 'normal', // Duration of display/closure
+		duration: '_default', // Duration of display/closure
 		beforeShowDay: null, // Function that takes a date and returns an array with
 			// [0] = true if selectable, false if not, [1] = custom CSS class name(s) or '',
 			// [2] = cell title (optional), e.g. $.datepicker.noWeekends