diff --git a/scripts/upgrade b/scripts/upgrade
index fd06324..0faaaef 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -77,7 +77,11 @@ ynh_abort_if_errors
 #=================================================
 ynh_script_progression --message="Upgrading source files..." --weight=5
 
-$upgrade_type == "UPGRADE_APP"
+if [ "$upgrade_type" == "UPGRADE_APP" ]
+then
+  # Download, check integrity, uncompress and patch the source from app.src
+  ynh_setup_source --dest_dir="$final_path"
+fi
 
 #=================================================
 # CREATE DEDICATED USER