diff --git a/scripts/upgrade b/scripts/upgrade
index d8e88d9..e18bffd 100755
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -20,7 +20,7 @@ ynh_script_progression --message="Ensuring downward compatibility..." --weight=1
 ynh_script_progression --message="Upgrading source files..."
 
 # Download, check integrity, uncompress and patch the source from app.src
-ynh_setup_source --dest_dir="$install_dir" --full_replace --keep="instance"
+ynh_setup_source --dest_dir="$install_dir" --full_replace=1 --keep="instance"
 
 chmod o-rwx "$install_dir"
 chown -R $app:www-data "$install_dir"