diff --git a/nginx/start.sh b/nginx/start.sh
index 2cb65f1a..9f1c874f 100755
--- a/nginx/start.sh
+++ b/nginx/start.sh
@@ -1,6 +1,6 @@
 #!/bin/sh
 
-if [[ -z ENABLE_CERTBOT || -f /certs/cert.pem ]]
+if [[ -z $ENABLE_CERTBOT || -f /certs/cert.pem ]]
 then
   cp /etc/nginx/nginx.conf.default /etc/nginx/nginx.conf
 else