diff --git a/jquery-ui-timepicker-addon.js b/jquery-ui-timepicker-addon.js
index 1517757..79bc184 100644
--- a/jquery-ui-timepicker-addon.js
+++ b/jquery-ui-timepicker-addon.js
@@ -831,6 +831,7 @@ $.datepicker._doKeyPress = function(event) {
 								" " +
 								tp_inst._defaults.separator +
 								tp_inst._defaults.timeSuffix +
+								(tp_inst._defaults.showTimezone ? tp_inst._defaults.timezoneList.join('') : '') +
 								dateChars,
 				chr = String.fromCharCode(event.charCode === undefined ? event.keyCode : event.charCode);
 			return event.ctrlKey || (chr < ' ' || !dateChars || datetimeChars.indexOf(chr) > -1);