diff --git a/calendar/inc/class.calendar_uiforms.inc.php b/calendar/inc/class.calendar_uiforms.inc.php
index 4fbdb11956..727f8d500f 100644
--- a/calendar/inc/class.calendar_uiforms.inc.php
+++ b/calendar/inc/class.calendar_uiforms.inc.php
@@ -189,6 +189,17 @@ class calendar_uiforms extends calendar_ui
 			unset($content['recur_exception']['delete_exception']);
 			if (($key = array_search($date,$content['recur_exception'])) !== false)
 			{
+				// propagate the exception to a single event
+				$recur_exceptions = $this->bo->so->get_related($content['uid']);
+				foreach ($recur_exceptions as $id)
+				{
+					if (!($exception = $this->bo->read($id)) ||
+							$exception['recurrence'] != $content['recur_exception'][$key]) continue;
+					$exception['uid'] = common::generate_uid('calendar', $id);
+					$exception['reference'] = $exception['recurrence'] = 0;
+					$this->bo->update($exception, true);
+					break;
+				}
 				unset($content['recur_exception'][$key]);
 				$content['recur_exception'] = array_values($content['recur_exception']);
 			}