diff --git a/dev_env_setup.sh b/dev_env_setup.sh
index ecb0067..acfbe5d 100755
--- a/dev_env_setup.sh
+++ b/dev_env_setup.sh
@@ -116,7 +116,7 @@ while true; do
             sudo chmod 644 "$cert_path"/"$cert_name".crt
             sudo chmod 600 "$cert_path"/"$cert_name".key
             sudo cp assets/config/nginx/nginx_SSL.conf /etc/nginx/sites-enabled/$(hostname).conf
-            sudo sed -i.backup "s/DOMAIN/$(hostname).local/g" /etc/nginx/sites-enabled/$(hostname).conf
+            sudo sed -i "s/DOMAIN/$(hostname).local/g" /etc/nginx/sites-enabled/$(hostname).conf
             sudo sed -i "s/IPADDR/$ip4/g" /etc/nginx/sites-enabled/$(hostname).conf
             sudo sed -i "s|CERTPATH|$cert_path/$cert_name|" /etc/nginx/sites-enabled/$(hostname).conf
             sudo sed -i "s|KEYPATH|$cert_path/$cert_name|" /etc/nginx/sites-enabled/$(hostname).conf