Index: wp-includes/capabilities.php
===================================================================
--- wp-includes/capabilities.php	(revision 19630)
+++ wp-includes/capabilities.php	(working copy)
@@ -1100,6 +1100,10 @@
 		}
 		break;
 	case 'edit_comment':
+		if ( user_can( $user_id, 'moderate_comments' ) ) {
+			$caps[] = 'moderate_comments';
+			break;
+		}
 		$comment = get_comment( $args[0] );
 		$post = get_post( $comment->comment_post_ID );
 		$post_type_object = get_post_type_object( $post->post_type );