1 files changed, 1 insertions, 1 deletions
diff --git a/threads.js b/threads.js
index d5040c5..574fd35 100644
--- a/threads.js
+++ b/threads.js
@@ -1307,7 +1307,7 @@ Process.prototype.doInsertInList = function (element, index, list) {
         return null;
     }
     if (this.inputOption(index) === 'any') {
-        idx = this.reportRandom(1, list.length());
+        idx = this.reportRandom(1, list.length() + 1);
     }
     if (this.inputOption(index) === 'last') {
         idx = list.length() + 1;