Index: wp-admin/includes/ajax-actions.php
===================================================================
--- wp-admin/includes/ajax-actions.php	(revision 19932)
+++ wp-admin/includes/ajax-actions.php	(working copy)
@@ -150,7 +150,7 @@
 }
 
 function wp_ajax_autocomplete_user() {
-	if ( !is_multisite() || !current_user_can( 'promote_users' ) || wp_is_large_network( 'users' ) || !is_super_admin() && apply_filters( 'autocomplete_users_for_site_admins', false ) )
+	if ( ! is_multisite() || ! current_user_can( 'promote_users' ) || wp_is_large_network( 'users' ) || ( ! is_super_admin() && ! apply_filters( 'autocomplete_users_for_site_admins', false ) ) )
 		wp_die( -1 );
 	
 	$return = array();
@@ -1675,4 +1675,4 @@
 
 	update_user_meta( get_current_user_id(), 'dismissed_wp_pointers', $dismissed );
 	wp_die( 1 );
-}
\ No newline at end of file
+}
Index: wp-admin/user-new.php
===================================================================
--- wp-admin/user-new.php	(revision 19932)
+++ wp-admin/user-new.php	(working copy)
@@ -178,7 +178,7 @@
 
 wp_enqueue_script('wp-ajax-response');
 wp_enqueue_script('user-profile');
-if ( is_multisite() && current_user_can( 'promote_users' ) && !wp_is_large_network( 'users' ) && is_super_admin() || apply_filters( 'autocomplete_users_for_site_admins', false ) )
+if ( is_multisite() && current_user_can( 'promote_users' ) && !wp_is_large_network( 'users' ) && ( is_super_admin() || apply_filters( 'autocomplete_users_for_site_admins', false ) ) )
 	wp_enqueue_script( 'user-search' );
 
 require_once( 'admin-header.php' );