diff --git a/pkg/spao/mac.go b/pkg/spao/mac.go
index ba78ff9684..6ef8687f98 100644
--- a/pkg/spao/mac.go
+++ b/pkg/spao/mac.go
@@ -208,11 +208,6 @@ func zeroOutWithBase(base scion.Base, buf []byte) {
 	}
 }
 
-func bigEndian(b []byte) uint64 {
-	return uint64(b[0])<<40 + uint64(b[1]) +
-		uint64(binary.BigEndian.Uint32(b[2:6]))
-}
-
 func bigEndianPutUint48(b []byte, v uint64) {
 	b[0] = byte(v >> 40)
 	b[1] = byte(v >> 32)
diff --git a/pkg/spao/timestamp_test.go b/pkg/spao/timestamp_test.go
index 577f4673d2..8d8f61e3d2 100644
--- a/pkg/spao/timestamp_test.go
+++ b/pkg/spao/timestamp_test.go
@@ -1,13 +1,28 @@
+// Copyright 2022 ETH Zurich
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package spao_test
 
 import (
 	"testing"
 	"time"
 
+	"github.com/stretchr/testify/assert"
+
 	"github.com/scionproto/scion/pkg/drkey"
 	"github.com/scionproto/scion/pkg/spao"
 	"github.com/scionproto/scion/private/drkey/drkeyutil"
-	"github.com/stretchr/testify/assert"
 )
 
 func TestTimestamp(t *testing.T) {
diff --git a/private/drkey/drkeyutil/drkey.go b/private/drkey/drkeyutil/drkey.go
index 7f34d5e0d7..95710db97e 100644
--- a/private/drkey/drkeyutil/drkey.go
+++ b/private/drkey/drkeyutil/drkey.go
@@ -1,3 +1,17 @@
+// Copyright 2023 ETH Zurich
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package drkeyutil
 
 import (
@@ -12,14 +26,14 @@ const (
 	DefaultEpochDuration   = 24 * time.Hour
 	DefaultPrefetchEntries = 10000
 	EnvVarEpochDuration    = "SCION_TESTING_DRKEY_EPOCH_DURATION"
-	// DefaultAcceptanceWindowOffset is the time width for accepting incoming packets. The
+	// DefaultAcceptanceWindowLength is the time width for accepting incoming packets. The
 	// acceptance widown is then compute as:
 	// aw := [T-a, T+a)
 	// where aw:= acceptance window, T := time instant and a := acceptanceWindowOffset
 	//
 	// Picking the value equal or shorter than half of the drkey Grace Period ensures
 	// that we accept packets for active keys only.
-	DefaultAcceptanceWindowLength = 5
+	DefaultAcceptanceWindowLength = 5 * time.Minute
 	EnvVarAccpetanceWindow        = "SCION_TESTING_ACCEPTANCE_WINDOW"
 )
 
diff --git a/tools/braccept/cases/scmp_traceroute.go b/tools/braccept/cases/scmp_traceroute.go
index d70f693744..b405ce04ca 100644
--- a/tools/braccept/cases/scmp_traceroute.go
+++ b/tools/braccept/cases/scmp_traceroute.go
@@ -260,7 +260,8 @@ func SCMPTracerouteIngressWithSPAO(artifactsDir string, mac hash.Hash) runner.Ca
 
 	sendTime := time.Now()
 	key, err := (&drkeyutil.FakeProvider{
-		EpochDuration: drkeyutil.LoadEpochDuration(),
+		EpochDuration:    drkeyutil.LoadEpochDuration(),
+		AcceptanceWindow: drkeyutil.LoadAcceptanceWindow(),
 	}).GetASHostKey(sendTime, xtest.MustParseIA("1-ff00:0:4"), srcA)
 	if err != nil {
 		panic(err)