diff --git a/wp-includes/pluggable.php b/wp-includes/pluggable.php
index e4fa9f1cd8..bac66d23fd 100644
--- a/wp-includes/pluggable.php
+++ b/wp-includes/pluggable.php
@@ -1195,7 +1195,7 @@ function get_avatar( $id_or_email, $size = '96', $default = '' ) {
 	} elseif ( is_object($id_or_email) ) {
 		if ( !empty($id_or_email->user_id) ) {
 			$id = (int) $id_or_email->user_id;
-			$user = get_userdata();
+			$user = get_userdata($id);
 			if ( $user)
 				$email = $user->user_email;
 		} elseif ( !empty($id_or_email->comment_author_email) ) {