diff --git a/docker-compose.yml b/docker-compose.yml
index c80191a..964d9f4 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -7,8 +7,8 @@ services:
     image: registry.bitdeals.org/certbot
     restart: unless-stopped
     environment:
-      - DOMAIN=
-      - EMAIL= # optional for notifications
+      - CERTBOT_DOMAIN=
+      - CERTBOT_EMAIL= # optional for notifications
     volumes:
       - certificates:/etc/certificates
       - letsencrypt:/etc/letsencrypt
diff --git a/docker/scripts/0-create-cert.sh b/docker/scripts/0-create-cert.sh
index 95aff2a..6a5d8df 100644
--- a/docker/scripts/0-create-cert.sh
+++ b/docker/scripts/0-create-cert.sh
@@ -11,20 +11,20 @@ if [ ! -f /etc/certificates/site.pem ]; then
 fi
 
 # check e-mail for letsencrypt notifications
-if [ -n "$EMAIL" ]; then
-  CERTBOT_OPTS="--email $EMAIL"
+if [ -n "$CERTBOT_EMAIL" ]; then
+  CERTBOT_OPTS="--email $CERTBOT_EMAIL"
 else
   CERTBOT_OPTS="--register-unsafely-without-email"
 fi
 
-if [ -n "$DOMAIN" ]; then
+if [ -n "$CERTBOT_DOMAIN" ]; then
 
   # Request certificate
   certbot certonly --standalone \
     --non-interactive --agree-tos --http-01-port=380 \
     "$CERTBOT_OPTS" \
-    --cert-name "$DOMAIN" \
-    -d "$DOMAIN"
+    --cert-name "$CERTBOT_DOMAIN" \
+    -d "$CERTBOT_DOMAIN"
 
   # Concatenate certificates
   . $(dirname $0)/2-concatenate-cert.sh
diff --git a/docker/scripts/1-renew-cert.sh b/docker/scripts/1-renew-cert.sh
index 20f7336..7768f63 100644
--- a/docker/scripts/1-renew-cert.sh
+++ b/docker/scripts/1-renew-cert.sh
@@ -1,7 +1,7 @@
 #!/bin/sh
 
 # Certificates exist
-if [ -n "$DOMAIN" -a -d /etc/letsencrypt/live/"$DOMAIN" ]; then
+if [ -n "$CERTBOT_DOMAIN" -a -d /etc/letsencrypt/live/"$CERTBOT_DOMAIN" ]; then
   # Check certificates and renew them
   certbot renew --http-01-port=380
 
diff --git a/docker/scripts/2-concatenate-cert.sh b/docker/scripts/2-concatenate-cert.sh
index 1cf5652..8c1bdbd 100644
--- a/docker/scripts/2-concatenate-cert.sh
+++ b/docker/scripts/2-concatenate-cert.sh
@@ -1,6 +1,6 @@
 #!/bin/sh
 
-cd /etc/letsencrypt/live/"$DOMAIN"
+cd /etc/letsencrypt/live/"$CERTBOT_DOMAIN"
 
 if [ -f fullchain.pem -a -f privkey.pem ]; then
   cat fullchain.pem privkey.pem > /etc/certificates/site.pem