diff --git a/phpgwapi/inc/class.html.inc.php b/phpgwapi/inc/class.html.inc.php
index e85f3d6ec3..c2053fcc18 100644
--- a/phpgwapi/inc/class.html.inc.php
+++ b/phpgwapi/inc/class.html.inc.php
@@ -1225,6 +1225,7 @@ class html
 		$html = self::div("\n",'id="'.$tree.'"',$_divClass).$html;
 		$html .= "<script type='text/javascript'>\n";
 		$html .= "var $tree = new dhtmlXTreeObject('$tree','100%','100%',0);\n";
+		$html .= "$tree.parentObject.style.overflow='auto';\n";	// dhtmlXTree constructor has hidden hardcoded
 		if (translation::charset() == 'utf-8') $html .= "if ($tree.setEscapingMode) $tree.setEscapingMode('utf8');\n";
 		$html .= "$tree.setImagePath('$folderImageDir/dhtmlxtree/');\n";