Index: templates/default/bbpress/form-topic-merge.php
===================================================================
--- templates/default/bbpress/form-topic-merge.php	(revision 4894)
+++ templates/default/bbpress/form-topic-merge.php	(working copy)
@@ -48,7 +48,8 @@
 											'selected'    => -1,
 											'exclude'     => bbp_get_topic_id(),
 											'select_id'   => 'bbp_destination_topic',
-											'none_found'  => __( 'No topics were found to which the topic could be merged to!', 'bbpress' )
+											'none_found'  => __( 'No topics were found to which the topic could be merged to!', 'bbpress' ),
+											'orderby'     => 'title'
 										) );
 									?>