diff --git a/dhcp4/conn_test.go b/dhcp4/conn_test.go
index 9654ebe..f15b0dc 100644
--- a/dhcp4/conn_test.go
+++ b/dhcp4/conn_test.go
@@ -20,7 +20,7 @@ import (
 	"testing"
 	"time"
 
-	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 )
 
 func testConn(t *testing.T, impl conn, addr string) {
@@ -55,7 +55,7 @@ func testConn(t *testing.T, impl conn, addr string) {
 
 	go func() {
 		_, err := s.Write(bs)
-		assert.NoError(t, err)
+		require.NoError(t, err)
 	}()
 	if err = c.SetReadDeadline(time.Now().Add(time.Second)); err != nil {
 		t.Fatal(err)
@@ -86,7 +86,7 @@ func testConn(t *testing.T, impl conn, addr string) {
 	ch := make(chan *Packet, 1)
 	go func() {
 		err := s.SetReadDeadline(time.Now().Add(time.Second))
-		assert.NoError(t, err)
+		require.NoError(t, err)
 		var buf [1500]byte
 		n, err := s.Read(buf[:])
 		if err != nil {
diff --git a/dhcp6/pool/random_address_pool_test.go b/dhcp6/pool/random_address_pool_test.go
index 4be416d..28cf64b 100644
--- a/dhcp6/pool/random_address_pool_test.go
+++ b/dhcp6/pool/random_address_pool_test.go
@@ -5,7 +5,7 @@ import (
 	"testing"
 	"time"
 
-	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 )
 
 func TestReserveAddress(t *testing.T) {
@@ -60,7 +60,7 @@ func TestReserveAddressUpdatesAddressPool(t *testing.T) {
 	pool := NewRandomAddressPool(net.ParseIP("2001:db8:f00f:cafe::1"), 1, expectedMaxLifetime)
 	pool.timeNow = func() time.Time { return expectedTime }
 	_, err := pool.ReserveAddresses(expectedClientID, [][]byte{expectedIAID})
-	assert.NoError(t, err)
+	require.NoError(t, err)
 
 	expectedIdx := pool.calculateIAIDHash(expectedClientID, expectedIAID)
 
@@ -83,7 +83,7 @@ func TestReserveAddressKeepsTrackOfUsedAddresses(t *testing.T) {
 	pool := NewRandomAddressPool(net.ParseIP("2001:db8:f00f:cafe::1"), 1, expectedMaxLifetime)
 	pool.timeNow = func() time.Time { return expectedTime }
 	_, err := pool.ReserveAddresses(expectedClientID, [][]byte{expectedIAID})
-	assert.NoError(t, err)
+	require.NoError(t, err)
 	_, exists := pool.usedIps[0x01]
 	if !exists {
 		t.Fatal("'2001:db8:f00f:cafe::1' should be marked as in use")
@@ -99,8 +99,8 @@ func TestReserveAddressKeepsTrackOfAssociationExpiration(t *testing.T) {
 	pool := NewRandomAddressPool(net.ParseIP("2001:db8:f00f:cafe::1"), 1, expectedMaxLifetime)
 	pool.timeNow = func() time.Time { return expectedTime }
 	_, err := pool.ReserveAddresses(expectedClientID, [][]byte{expectedIAID})
-	assert.NoError(t, err)
-	
+	require.NoError(t, err)
+
 	expiration := pool.identityAssociationExpirations.Peek().(*associationExpiration)
 	if expiration == nil {
 		t.Fatal("Expected an identity association expiration, but got nil")
diff --git a/pixiecore/booters.go b/pixiecore/booters.go
index 8eeeacb..8a33e5f 100644
--- a/pixiecore/booters.go
+++ b/pixiecore/booters.go
@@ -28,9 +28,10 @@ import (
 	"text/template"
 	"time"
 
+	"go.uber.org/zap"
+
 	v1 "github.com/metal-stack/metal-api/pkg/api/v1"
 	"github.com/metal-stack/pixie/api"
-	"go.uber.org/zap"
 )
 
 // APIBooter gets a BootSpec from a remote server over HTTP.
@@ -111,14 +112,14 @@ func (g *grpcbooter) BootSpec(m Machine) (*Spec, error) {
 		}
 		g.log.Infow("boot", "resp", resp)
 
-		cmdline := []string{*resp.Cmdline, fmt.Sprintf("PIXIE_API_URL=%s", g.config.PixieAPIURL)}
+		cmdline := []string{resp.GetCmdline(), fmt.Sprintf("PIXIE_API_URL=%s", g.config.PixieAPIURL)}
 		if g.config.Debug {
 			cmdline = append(cmdline, "DEBUG=1")
 		}
 
 		r = rawSpec{
-			Kernel:  resp.Kernel,
-			Initrd:  resp.InitRamDisks,
+			Kernel:  resp.GetKernel(),
+			Initrd:  resp.GetInitRamDisks(),
 			Cmdline: strings.Join(cmdline, " "),
 		}
 	}