diff --git a/global-functions.rsc b/global-functions.rsc
index 8ade79b..d666122 100644
--- a/global-functions.rsc
+++ b/global-functions.rsc
@@ -1388,7 +1388,7 @@
 # lock script against multiple invocation
 :set ScriptLock do={
   :local Script   [ :tostr $1 ];
-  :local WaitMax ([ :tonum $3 ] * 10);
+  :local WaitMax ([ :tonum $2 ] * 10);
 
   :global GetRandom20CharAlNum;
   :global IfThenElse;