diff --git a/haraka.sh b/haraka.sh
index 5d7fc15..88a2c66 100644
--- a/haraka.sh
+++ b/haraka.sh
@@ -9,7 +9,7 @@ fi
 echo $HOSTNAME > /haraka/config/me
 
 # Get and install certificates from Let's Encrypt
-if [ ! -f /haraka/config/tls ]; then
+if [ ! -d /haraka/config/tls ]; then
   certbot certonly -n --agree-tos --email "$EMAIL" -d "$HOSTNAME" --standalone --preferred-challenges http
   mkdir -p /haraka/config/tls
   cd /haraka/config/tls