diff --git a/debug.go b/debug.go
index f10ac30..7d2f07c 100644
--- a/debug.go
+++ b/debug.go
@@ -3,7 +3,6 @@
 package main
 
 import (
-	"log"
 	"net/http"
 	_ "net/http/pprof"
 	"os"
@@ -14,10 +13,10 @@ func init() {
 	if listen == "" {
 		listen = "[::]:8082"
 	}
-	log.Printf("profiling is enabled, HTTP server is attached to %s\n", listen)
+	stdout.Printf("profiling is enabled, HTTP server is attached to %s\n", listen)
 	go func() {
 		if err := http.ListenAndServe(listen, nil); err != nil {
-			log.Fatalf("http failed: %v\n", err)
+			stderr.Fatalf("http failed: %v\n", err)
 		}
 	}()
 }