diff --git a/install/get-teamware.sh b/install/get-teamware.sh
index 9cf804b5..e7a5e30a 100644
--- a/install/get-teamware.sh
+++ b/install/get-teamware.sh
@@ -55,7 +55,7 @@ set -a
 
 if [ -f .env -a -f docker-compose.yml ]; then
 
-  if [ ! ( -f create-django-db.sh -a -f generate-docker-env.sh ) ]; then
+  if ! [ -f create-django-db.sh -a -f generate-docker-env.sh ]; then
     echo 'You have run this upgrade script in a folder that contains a docker compose'
     echo 'application stack, but it does not appear to be an installation of GATE'
     echo 'Teamware.  You should run this script either in a completely empty directory'