diff --git a/HACKING b/HACKING
index 3d79e9e8..232a353f 100644
--- a/HACKING
+++ b/HACKING
@@ -157,4 +157,4 @@ Internationalization (i18n) Strings
 
   Example:
     msg = _("The server with id %(s_id)s has no key %(m_key)s")
-    LOG.error(msg % (s_id="1234, m_key="imageId"))
+    LOG.error(msg % {"s_id": "1234", "m_key": "imageId"})