diff --git a/log-forward b/log-forward
index 0500072..40afbe6 100644
--- a/log-forward
+++ b/log-forward
@@ -12,10 +12,13 @@
 
 :global LogPrintExit;
 :global MailServerIsUp;
+:global ScriptLock;
 :global SendNotification;
 :global SymbolForNotification;
 :global WaitFullyConnected;
 
+$ScriptLock "log-forward";
+
 $WaitFullyConnected;
 
 :if ($MailServerIsUp = false) do={