diff --git a/code/dataobjects/Comment.php b/code/dataobjects/Comment.php
index 582e3ee..0e6327f 100755
--- a/code/dataobjects/Comment.php
+++ b/code/dataobjects/Comment.php
@@ -403,6 +403,8 @@ class Comment extends DataObject {
 		$use_gravatar = Commenting::get_config_value($this->BaseClass, 'use_gravatar');
 		if ($use_gravatar) {
 			$gravatar = "http://www.gravatar.com/avatar/" . md5( strtolower(trim($this->Email)));
+			$gravatarsize = Commenting::get_config_value($this->BaseClass, 'gravatar_size');
+			$gravatar.= "?s=".$gravatarsize."&d=mm";
 		}
 
 		return $gravatar;