diff --git a/wo/cli/plugins/stack_pref.py b/wo/cli/plugins/stack_pref.py
index 6ff37be..b49b3fe 100644
--- a/wo/cli/plugins/stack_pref.py
+++ b/wo/cli/plugins/stack_pref.py
@@ -473,7 +473,7 @@ def post_pref(self, apt_packages, packages, upgrade=False):
 
         # php conf
         php_list = []
-        for pargs_version, version in WOVar.wo_php_versions.items():
+        for version in list(WOVar.wo_php_versions.values()):
             package_name = 'php' + version.replace('.', '') + '-fpm'
             if package_name in apt_packages:
                 php_list.append([version])