diff --git a/scripts/upgrade b/scripts/upgrade
index 4f90781..c17e2fa 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -33,7 +33,7 @@ fi
 # now need to be installed under its own domain.
 # If the app is currently installed under a path, we warn the admin
 # that he should move the app under its own domain
-if [ -n "$path" ]; then
+if [ "$path" != "/" ]; then
   ynh_die --message="Since version 2.0.0, $app need to be installed under its own domain. \
   Before upgrading, change $app URL: delete the path and switch to a new domain if needed."
 fi