diff --git a/xpra/x11/models/base.py b/xpra/x11/models/base.py
index 7212428b8a..277e181219 100644
--- a/xpra/x11/models/base.py
+++ b/xpra/x11/models/base.py
@@ -608,7 +608,7 @@ def update_wm_state(prop):
             elif atom1=="_NET_WM_STATE_DEMANDS_ATTENTION":
                 update_wm_state("attention-requested")
             else:
-                log.info("Unhandled _NET_WM_STATE request: '%s'", event, atom1)
+                log.info("Unhandled _NET_WM_STATE request: '%s'", atom1)
                 log.info(" event%s", event)
             return True
         if event.message_type=="WM_CHANGE_STATE":