diff --git a/main.go b/main.go
index 8c5eed1..20e939b 100644
--- a/main.go
+++ b/main.go
@@ -83,9 +83,9 @@ func main() {
 
 	var handle http.Handler
 	if proxyHost != "" {
-		fmt.Fprintf(os.Stderr, "ProxyHost %s\n", proxyHost)
+		log.Printf("ProxyHost %s\n", proxyHost)
 		if excludeHost != "" {
-			fmt.Fprintf(os.Stderr, "ExcludeHost %s\n", excludeHost)
+			log.Printf("ExcludeHost %s\n", excludeHost)
 		}
 		handle = &logger{proxy.NewRouter(proxy.NewServer(new(ops)), &proxy.RouterOptions{
 			Pattern: excludeHost,
@@ -129,7 +129,7 @@ func (l *logger) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	start := time.Now()
 	rl := &responseLogger{code: 200, ResponseWriter: w}
 	l.h.ServeHTTP(rl, r)
-	fmt.Fprintf(os.Stderr, "%.3fs %d %s\n", time.Since(start).Seconds(), rl.code, r.URL)
+	log.Printf("%.3fs %d %s\n", time.Since(start).Seconds(), rl.code, r.URL)
 }
 
 // An ops is a proxy.ServerOps implementation.
diff --git a/proxy/router.go b/proxy/router.go
index 1a8f7ae..e69daf1 100644
--- a/proxy/router.go
+++ b/proxy/router.go
@@ -2,11 +2,10 @@ package proxy
 
 import (
 	"crypto/tls"
-	"fmt"
+	"log"
 	"net/http"
 	"net/http/httputil"
 	"net/url"
-	"os"
 	"path"
 	"strings"
 )
@@ -59,11 +58,11 @@ func (rt *Router) Direct(path string) bool {
 
 func (rt *Router) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	if rt.proxy != nil && rt.Direct(r.URL.Path) {
-		fmt.Fprintf(os.Stderr, "------ --- %s [direct]\n", r.URL)
+		log.Printf("------ --- %s [direct]\n", r.URL)
 		rt.srv.ServeHTTP(w, r)
 		return
 	}
-	fmt.Fprintf(os.Stderr, "------ --- %s [proxy]\n", r.URL)
+	log.Printf("------ --- %s [proxy]\n", r.URL)
 	rt.proxy.ServeHTTP(w, r)
 	return
 }