diff --git a/src/jquery-ui-timepicker-addon.js b/src/jquery-ui-timepicker-addon.js
index 58d66539..2a28a15f 100644
--- a/src/jquery-ui-timepicker-addon.js
+++ b/src/jquery-ui-timepicker-addon.js
@@ -1235,7 +1235,7 @@
 						ampm = '';
 						resTime.ampm = '';
 					} else {
-						ampm = $.inArray(treg[order.t].toUpperCase(), o.amNames) !== -1 ? 'AM' : 'PM';
+					    ampm = $.inArray(treg[order.t].toUpperCase(), $.map(o.amNames, function (x,i) {return x.toUpperCase() })) !== -1 ? 'AM' : 'PM';
 						resTime.ampm = o[ampm === 'AM' ? 'amNames' : 'pmNames'][0];
 					}
 				}