diff --git a/scripts/upgrade b/scripts/upgrade
index 5ecc164..ca5a603 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -54,7 +54,7 @@ ynh_abort_if_errors
 #=================================================
 ynh_script_progression --message="Ensuring downward compatibility..."
 
-if ["yunohost app info minio | grep -oEi [0-9]{4}" == "2022"]
+if [$(yunohost app info minio | grep -oEi [0-9]{4}) == "2022"]
 then
 	ynh_script_progression --message="Migration from Filesystem to Single-Node Single-Drive mode"
 else