diff --git a/agent/discovery/discovery.go b/agent/discovery/discovery.go
index 4ca38408..f9b665cc 100644
--- a/agent/discovery/discovery.go
+++ b/agent/discovery/discovery.go
@@ -20,8 +20,8 @@ type handler struct {
 
 func (h handler) Tracef(f string, args ...interface{}) {}
 func (h handler) Infof(f string, args ...interface{})  {}
-func (h handler) Warnf(f string, args ...interface{})  { log.Debug("SSDP: " + fmt.Sprintf(f, args)) }
-func (h handler) Errorf(f string, args ...interface{}) { log.Debug("SSDP: " + fmt.Sprintf(f, args)) }
+func (h handler) Warnf(f string, args ...interface{})  { log.Debug("SSDP: " + fmt.Sprintf(f, args...)) }
+func (h handler) Errorf(f string, args ...interface{}) { log.Debug("SSDP: " + fmt.Sprintf(f, args...)) }
 
 func (h handler) Response(message gossdp.ResponseMessage) {