Index: vocabindex.view.inc
===================================================================
--- vocabindex.view.inc
+++ vocabindex.view.inc
@@ -425,9 +425,10 @@
 function _vocabindex_list_render_tree($tree, $children, $vi, $pid = 0, &$zebra_i = 0) {
   $items = array();
 
+  $zebra_i = 0;
   for ($i = 0, $len_i = count($children[$pid]); $i < $len_i; $i++) {
     $zebra_i++;
-    $zebra = ($zebra_i % 2 == 0 ? 'even' : 'odd');
+    $zebra = ($zebra_i & 1 ? 'odd' : 'even');
     $term = $tree[$children[$pid][$i]];
 
     $term_children = NULL;