diff --git a/scripts/upgrade b/scripts/upgrade
index 73600b3..ee93427 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -128,7 +128,7 @@ sleep 5
 ynh_secure_remove --file="$tmp_data_backup"
 
 # clean duplicate folder if exist
-if [ -d "$install_dir/data/data" ]
+if [ -d "$install_dir/data/data" ], then
 	ynh_secure_remove --file="$install_dir/data/data"
 fi