diff --git a/htdocs/comm/action/index.php b/htdocs/comm/action/index.php
index f445c7f3596..5366720bfc6 100644
--- a/htdocs/comm/action/index.php
+++ b/htdocs/comm/action/index.php
@@ -1210,7 +1210,7 @@ function show_day_events($db, $day, $month, $year, $monthshown, $style, &$eventa
                     	// We decide to choose color of owner of event (event->userownerid is user id of owner, event->userassigned contains all users assigned to event)
                     	if (! empty($cacheusers[$event->userownerid]->color)) $color=$cacheusers[$event->userownerid]->color;
                     }
-                    else if ($event->type_code == 'ICALEVENT')
+                    else if ($event->type_code == 'ICALEVENT')      // Event come from external ical file
                     {
                     	$numical++;
                     	if (! empty($event->icalname)) {
@@ -1220,7 +1220,7 @@ function show_day_events($db, $day, $month, $year, $monthshown, $style, &$eventa
                     		$numicals[dol_string_nospecial($event->icalname)]++;
                     	}
                     	$color=$event->icalcolor;
-                    	$cssclass=(! empty($event->icalname)?'family_ext'.md5($event->icalname):'family_other unmovable');
+                    	$cssclass=(! empty($event->icalname)?'family_ext'.md5($event->icalname):'family_other');
                     }
                     else if ($event->type_code == 'BIRTHDAY')
                     {
@@ -1266,6 +1266,10 @@ function show_day_events($db, $day, $month, $year, $monthshown, $style, &$eventa
                     {
                         $cssclass.= " unmovable";
                     }
+                    else if ($event->type_code == 'ICALEVENT')
+                    {
+                        $cssclass.= " unmovable";
+                    }
                     else if ($event->date_end_in_calendar && date('Ymd',$event->date_start_in_calendar) != date('Ymd',$event->date_end_in_calendar))
                     {
                         $tmpyearend    = date('Y',$event->date_end_in_calendar);