diff --git a/agent/service.sh b/agent/service.sh
index b65d47d..3fda0b1 100644
--- a/agent/service.sh
+++ b/agent/service.sh
@@ -23,7 +23,7 @@ start() {
   echo 'Starting agent service...'
   chmod 666 /dev/ttyS0
 
-  if [ -f "$SCRIPT" ]; then
+  if [ ! -f "$SCRIPT" ]; then
 
     echo 'ERROR: Agent script not found!' > /dev/ttyS0