Index: bp-core/bp-core-cssjs.php
===================================================================
--- bp-core/bp-core-cssjs.php	(revision 6717)
+++ bp-core/bp-core-cssjs.php	(working copy)
@@ -150,7 +150,7 @@
 function bp_core_add_ajax_url_js() {
 ?>
 
-	<script type="text/javascript">var ajaxurl = '<?php echo admin_url( 'admin-ajax.php' ); ?>';</script>
+	<script type="text/javascript">var ajaxurl = '<?php echo network_site_url( '/wp-admin/admin-ajax.php' ); ?>';</script>
 
 <?php
 }
Index: bp-templates/bp-legacy/buddypress-functions.php
===================================================================
--- bp-templates/bp-legacy/buddypress-functions.php	(revision 6717)
+++ bp-templates/bp-legacy/buddypress-functions.php	(working copy)
@@ -278,7 +278,7 @@
 
 		<script type="text/javascript" charset="utf-8">
 			/* <![CDATA[ */
-			var ajaxurl = '<?php echo admin_url( 'admin-ajax.php' ); ?>';
+			var ajaxurl = '<?php echo network_site_url( '/wp-admin/admin-ajax.php' ); ?>';
 			/* ]]> */
 		</script>