diff --git a/bin/service/netrpc_server.py b/bin/service/netrpc_server.py
index d953f98901d..50e9b5e7a9b 100644
--- a/bin/service/netrpc_server.py
+++ b/bin/service/netrpc_server.py
@@ -78,7 +78,7 @@ class TinySocketClientThread(threading.Thread, netsvc.OpenERPDispatcher):
                     break
             except Exception, e:
                 # this code should not be reachable, therefore we warn
-                netsvc.Logger().notifyChannel("net-rpc", netsvc.LOG_WARNING, "exception: %" % str(e))
+                netsvc.Logger().notifyChannel("net-rpc", netsvc.LOG_WARNING, "exception: %s" % str(e))
                 break
 
         self.threads.remove(self)