diff --git a/jquery-ui-timepicker-addon.js b/jquery-ui-timepicker-addon.js
index 3fbd7b5..af51092 100644
--- a/jquery-ui-timepicker-addon.js
+++ b/jquery-ui-timepicker-addon.js
@@ -1254,6 +1254,33 @@
 		return $.datepicker._base_doKeyPress(event);
 	};
 
+	/*
+	* Fourth bad hack :/ override _updateAlternate function used in inline mode to init altField
+	*/
+	$.datepicker._base_updateAlternate = $.datepicker._updateAlternate;
+	/* Update any alternate field to synchronise with the main field. */
+	$.datepicker._updateAlternate = function(inst) {
+		tp_inst = this._get(inst, 'timepicker');
+		var altField = tp_inst._defaults.altField;
+		if (altField) { // update alternate field too
+			var altFormat = tp_inst._defaults.altFormat || tp_inst._defaults.dateFormat;
+			var date = this._getDate(inst);
+			var formatCfg = $.datepicker._getFormatConfig(inst);
+			var altFormattedDateTime = '', altSeparator = tp_inst._defaults.altSeparator ? tp_inst._defaults.altSeparator : tp_inst._defaults.separator, altTimeSuffix = tp_inst._defaults.altTimeSuffix ? tp_inst._defaults.altTimeSuffix : tp_inst._defaults.timeSuffix;
+			if (tp_inst._defaults.altFormat)
+				altFormattedDateTime = $.datepicker.formatDate(tp_inst._defaults.altFormat, (date === null ? new Date() : date), formatCfg);
+			else
+				altFormattedDateTime = tp_inst.formattedDate;
+			if (altFormattedDateTime)
+				altFormattedDateTime += altSeparator;
+			if (tp_inst._defaults.altTimeFormat)
+				altFormattedDateTime += $.datepicker.formatTime(tp_inst._defaults.altTimeFormat, tp_inst, tp_inst._defaults) + altTimeSuffix;
+			else
+				altFormattedDateTime += tp_inst.formattedTime + altTimeSuffix;
+
+			$(altField).each(function() { $(this).val(altFormattedDateTime); });
+		}
+	},
 	/*
 	* Override key up event to sync manual input changes.
 	*/