diff --git a/calendar/inc/class.calendar_hooks.inc.php b/calendar/inc/class.calendar_hooks.inc.php
index bc58dc48b9..71bf9b4722 100644
--- a/calendar/inc/class.calendar_hooks.inc.php
+++ b/calendar/inc/class.calendar_hooks.inc.php
@@ -453,6 +453,15 @@ class calendar_hooks
 				'xmlrpc' => True,
 				'admin'  => False,
 			),
+			'no_category_custom_color' => array(
+				'type' => 'color',
+				'label' => 'Custom event color',
+				'no_lang' => true,
+				'name' => 'no_category_custom_color',
+				'help' => lang('Custom color for events without category color'),
+				'xmlrpc' => True,
+				'admin'  => False,
+			),
 			'3.section' => array(
 				'type'  => 'section',
 				'title' => lang('notification settings'),
diff --git a/calendar/js/app.js b/calendar/js/app.js
index 620c18e69a..08048386e0 100644
--- a/calendar/js/app.js
+++ b/calendar/js/app.js
@@ -121,6 +121,15 @@ app.classes.calendar = (function(){ "use strict"; return AppJS.extend(
 		// Scroll
 		jQuery(jQuery.proxy(this._scroll,this));
 		jQuery.extend(this.state, this.egw.preference('saved_states','calendar'));
+
+		// Set custom color for events without category
+		if(this.egw.preference('no_category_custom_color','calendar'))
+		{
+			this.egw.css(
+				'.calendar_calEvent:not([class*="cat_"])',
+				'background-color: '+this.egw.preference('no_category_custom_color','calendar')+' !important'
+			);
+		}
 	},
 
 	/**
diff --git a/calendar/lang/egw_en.lang b/calendar/lang/egw_en.lang
index 3daa1776fa..98a40f283e 100644
--- a/calendar/lang/egw_en.lang
+++ b/calendar/lang/egw_en.lang
@@ -116,6 +116,8 @@ csv	calendar	en	CSV
 csv-fieldname	calendar	en	CSV field name
 csv-filename	calendar	en	CSV file name
 custom	calendar	en	Custom
+custom event color	calendar	en	Custom event color
+custom color for events without category color	calendar	en	Custom color for events without category color
 custom fields	common	en	Custom fields
 custom url for ical with holidays for all users	calendar	en	Custom URL for iCal with holidays for all users
 custom_2	common	en	Free/Busy