diff --git a/lib/mcpu.py b/lib/mcpu.py
index 4a5dbd51f45b895319bc433a074b490d40238313..1efe0b88922a458e61bb5ea0eff8c2b45b3dc26c 100644
--- a/lib/mcpu.py
+++ b/lib/mcpu.py
@@ -342,8 +342,7 @@ class HooksMaster(object):
         res = results[node_name]
         if res.failed or res.data is False or not isinstance(res.data, list):
           if not res.offline:
-            self.proc.LogWarning("Communication failure to node %s" %
-                                 node_name)
+            self.proc.LogWarning("Communication failure to node %s", node_name)
           continue
         for script, hkr, output in res.data:
           if hkr == constants.HKR_FAIL: