diff --git a/log/log.go b/log/log.go
index 283d54fe8..cd84cc8b8 100644
--- a/log/log.go
+++ b/log/log.go
@@ -104,7 +104,7 @@ func Errorf(format string, v ...interface{}) {
 	logger.Output(calldepth, header("ERROR", fmt.Sprintf(format, v...)))
 }
 
-func Warning(format string, v ...interface{}) {
+func Warning(v ...interface{}) {
 	logger.Output(calldepth, header("WARN", fmt.Sprint(v...)))
 }