diff --git a/scripts/start.sh b/scripts/start.sh
index 93376b582..109cab3d1 100644
--- a/scripts/start.sh
+++ b/scripts/start.sh
@@ -27,7 +27,7 @@ docker-compose --version
 docker-compose -f $DOCKER_DIR/docker-compose.yml -f $DOCKER_DIR/docker-compose.$OS.yml down
 
 LETS_ENCRYPT_PATH = "${outputDir}/letsencrypt"
-if [ -d "LETS_ENCRYPT_PATH" ]
+if [ -d "${LETS_ENCRYPT_PATH}" ]
 then
     docker run -it --rm --name certbot -p 443:443 -p 80:80 -v $OUTPUT_DIR/letsencrypt:/etc/letsencrypt/ certbot/certbot \
         renew --logs-dir /etc/letsencrypt/logs