diff --git a/core/htmlsanitizer.class.inc.php b/core/htmlsanitizer.class.inc.php
index 6df7c17f7..51ce677be 100644
--- a/core/htmlsanitizer.class.inc.php
+++ b/core/htmlsanitizer.class.inc.php
@@ -232,6 +232,7 @@ class HTMLDOMSanitizer extends HTMLSanitizer
 		'text-align',
 		'vertical-align',
 		'width',
+		'white-space',
 	);
 
 	public function __construct()