diff --git a/activityPub.go b/activityPub.go
index 3143e2b..95b29fa 100644
--- a/activityPub.go
+++ b/activityPub.go
@@ -68,10 +68,13 @@ func initActivityPub() error {
 	if err != nil {
 		return err
 	}
-	prefs := []httpsig.Algorithm{httpsig.RSA_SHA256}
-	digestAlgorithm := httpsig.DigestSha256
-	headersToSign := []string{httpsig.RequestTarget, "date", "host", "digest"}
-	apPostSigner, _, err = httpsig.NewSigner(prefs, digestAlgorithm, headersToSign, httpsig.Signature, 0)
+	apPostSigner, _, err = httpsig.NewSigner(
+		[]httpsig.Algorithm{httpsig.RSA_SHA256},
+		httpsig.DigestSha256,
+		[]string{httpsig.RequestTarget, "date", "host", "digest"},
+		httpsig.Signature,
+		0,
+	)
 	if err != nil {
 		return err
 	}
diff --git a/activityPubSending.go b/activityPubSending.go
index 65105ef..74ee9cc 100644
--- a/activityPubSending.go
+++ b/activityPubSending.go
@@ -96,14 +96,13 @@ func apQueueSendSigned(blogIri, to string, activity interface{}) error {
 }
 
 func apSendSigned(blogIri, to string, activity []byte) error {
-	// Copy activity to sign it
-	activityCopy := make([]byte, len(activity))
-	copy(activityCopy, activity)
 	// Create request context with timeout
 	ctx, cancel := context.WithTimeout(context.Background(), time.Minute)
 	defer cancel()
 	// Create request
-	r, err := http.NewRequestWithContext(ctx, http.MethodPost, to, bytes.NewBuffer(activity))
+	var requestBuffer bytes.Buffer
+	requestBuffer.Write(activity)
+	r, err := http.NewRequestWithContext(ctx, http.MethodPost, to, &requestBuffer)
 	if err != nil {
 		return err
 	}
@@ -119,7 +118,7 @@ func apSendSigned(blogIri, to string, activity []byte) error {
 	r.Header.Set("Host", iri.Host)
 	// Sign request
 	apPostSignMutex.Lock()
-	err = apPostSigner.SignRequest(apPrivateKey, blogIri+"#main-key", r, activityCopy)
+	err = apPostSigner.SignRequest(apPrivateKey, blogIri+"#main-key", r, activity)
 	apPostSignMutex.Unlock()
 	if err != nil {
 		return err