diff --git a/modules/webpush_topics/webpush_topics.module b/modules/webpush_topics/webpush_topics.module
index 9984deb..147bffd 100644
--- a/modules/webpush_topics/webpush_topics.module
+++ b/modules/webpush_topics/webpush_topics.module
@@ -77,7 +77,7 @@ function _webpush_topics_get_topics($include_all = TRUE) {
   $vocabulary = taxonomy_vocabulary_machine_name_load('webpush_topics');
   // Load terms in the sequence set up in the taxonomy.
   $terms = taxonomy_get_tree($vocabulary->vid);
-  foreach ($terms as $tid => $term) {
+  foreach ($terms as $key => $term) {
     $topics[$term->tid] = $term->name;
   }
   return $topics;