diff --git a/calendar/inc/class.bocalendar.inc.php b/calendar/inc/class.bocalendar.inc.php
index 8a3712ede5..1ddee25f46 100755
--- a/calendar/inc/class.bocalendar.inc.php
+++ b/calendar/inc/class.bocalendar.inc.php
@@ -180,7 +180,7 @@
 
 			if ($this->prefs['common']['timeformat'] == '12')
 			{
-				$this->users_timeformat = 'h:i a';
+				$this->users_timeformat = 'h:ia';
 			}
 			else
 			{