diff --git a/sms-forward.rsc b/sms-forward.rsc
index ddaa3a8..9c3e4a5 100644
--- a/sms-forward.rsc
+++ b/sms-forward.rsc
@@ -9,11 +9,11 @@
 # forward SMS to e-mail
 # https://rsc.eworm.de/doc/sms-forward.md
 
-:global GlobalFunctionsReady;
-:while ($GlobalFunctionsReady != true) do={ :delay 500ms; }
-
 :local ExitOK false;
 :onerror Err {
+  :global GlobalFunctionsReady;
+  :retry { :if ($GlobalFunctionsReady != true) \
+      do={ :error ("Global functions not ready."); }; } delay=500ms max=50;
   :local ScriptName [ :jobname ];
 
   :global Identity;