diff --git a/webform.module b/webform.module
index f829942..1fe320e 100755
--- a/webform.module
+++ b/webform.module
@@ -1002,7 +1002,7 @@ function webform_node_update($node) {
     $original_cids = array_keys($original->webform['components']);
     $current_cids = array_keys($node->webform['components']);
 
-    $all_cids = $original_cids + $current_cids;
+    $all_cids = array_merge($original_cids, $current_cids);
     $deleted_cids = array_diff($original_cids, $current_cids);
     $inserted_cids = array_diff($current_cids, $original_cids);