diff --git a/control/util.go b/control/util.go
index a32909c2..c8621720 100644
--- a/control/util.go
+++ b/control/util.go
@@ -277,7 +277,7 @@ func doPutZk(conn *zk.Conn, requests <-chan request, sameKey bool) {
 		var errStr string
 		if err != nil {
 			errStr = err.Error()
-			fmt.Println("doPutZk err:", err)
+			log.Println("doPutZk err:", err)
 		}
 		results <- result{errStr: errStr, duration: time.Since(st), happened: time.Now()}
 		bar.Increment()