diff --git a/scripts/install b/scripts/install
index 174144e..f6d0c9f 100755
--- a/scripts/install
+++ b/scripts/install
@@ -24,9 +24,9 @@ ynh_exec_warn_less ynh_install_nodejs --nodejs_version=$nodejs_version
 #=================================================
 ynh_script_progression --message="Setting up source files..." --weight=1
 
-# Download, check integrity, uncompress and patch the source from manifest.toml
 ynh_setup_source --dest_dir="$install_dir"
 
+chmod -R o-rwx "$install_dir"
 chown -R $app:www-data "$install_dir"
 
 #=================================================
@@ -34,7 +34,6 @@ chown -R $app:www-data "$install_dir"
 #=================================================
 ynh_script_progression --message="Adding system configurations related to $app..." --weight=1
 
-# Create a dedicated NGINX config using the conf/nginx.conf template
 ynh_add_nginx_config
 
 #=================================================
diff --git a/scripts/restore b/scripts/restore
index 4dad23d..348aed7 100755
--- a/scripts/restore
+++ b/scripts/restore
@@ -17,6 +17,7 @@ ynh_script_progression --message="Restoring the app main directory..." --weight=
 
 ynh_restore_file --origin_path="$install_dir"
 
+chmod -R o-rwx "$install_dir"
 chown -R $app:www-data "$install_dir"
 
 #=================================================
diff --git a/scripts/upgrade b/scripts/upgrade
index f408957..5bf2403 100755
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -28,10 +28,10 @@ if [ "$upgrade_type" == "UPGRADE_APP" ]
 then
 	ynh_script_progression --message="Upgrading source files..." --weight=1
 
-	# Download, check integrity, uncompress and patch the source from manifest.toml
 	ynh_setup_source --dest_dir="$install_dir" --keep="public/config.json"
 fi
 
+chmod -R o-rwx "$install_dir"
 chown -R $app:www-data "$install_dir"
 
 #=================================================