diff --git a/integration/dhcpv4/dhcpv4_test.go b/integration/dhcpv4/dhcpv4_test.go
index fd1ce0d..dace22d 100644
--- a/integration/dhcpv4/dhcpv4_test.go
+++ b/integration/dhcpv4/dhcpv4_test.go
@@ -32,8 +32,10 @@ import (
 func TestDHCPv4(t *testing.T) {
 	const ns = "ns0" // name of the network namespace to use for this test
 
-	if err := exec.Command("ip", "netns", "add", ns).Run(); err != nil {
-		t.Fatalf("ip netns add %s: %v", ns, err)
+	add := exec.Command("ip", "netns", "add", ns)
+	add.Stderr = os.Stderr
+	if err := add.Run(); err != nil {
+		t.Fatalf("%v: %v", add.Args, err)
 	}
 	defer exec.Command("ip", "netns", "delete", ns).Run()
 
diff --git a/integration/dhcpv6/dhcpv6_test.go b/integration/dhcpv6/dhcpv6_test.go
index 940f05c..0c97b16 100644
--- a/integration/dhcpv6/dhcpv6_test.go
+++ b/integration/dhcpv6/dhcpv6_test.go
@@ -32,8 +32,10 @@ var v6AddrRe = regexp.MustCompile(`2001:db8::[^ ]+`)
 func TestDHCPv6(t *testing.T) {
 	const ns = "ns1" // name of the network namespace to use for this test
 
-	if err := exec.Command("ip", "netns", "add", ns).Run(); err != nil {
-		t.Fatalf("ip netns add %s: %v", ns, err)
+	add := exec.Command("ip", "netns", "add", ns)
+	add.Stderr = os.Stderr
+	if err := add.Run(); err != nil {
+		t.Fatalf("%v: %v", add.Args, err)
 	}
 	defer exec.Command("ip", "netns", "delete", ns).Run()
 
diff --git a/integration/netconfig/netconfig_test.go b/integration/netconfig/netconfig_test.go
index d7ae4b1..973886d 100644
--- a/integration/netconfig/netconfig_test.go
+++ b/integration/netconfig/netconfig_test.go
@@ -153,8 +153,10 @@ func TestNetconfig(t *testing.T) {
 	}
 	const ns = "ns3" // name of the network namespace to use for this test
 
-	if err := exec.Command("ip", "netns", "add", ns).Run(); err != nil {
-		t.Fatalf("ip netns add %s: %v", ns, err)
+	add := exec.Command("ip", "netns", "add", ns)
+	add.Stderr = os.Stderr
+	if err := add.Run(); err != nil {
+		t.Fatalf("%v: %v", add.Args, err)
 	}
 	defer exec.Command("ip", "netns", "delete", ns).Run()
 
diff --git a/integration/radvd/radvd_test.go b/integration/radvd/radvd_test.go
index beae733..f027fdf 100644
--- a/integration/radvd/radvd_test.go
+++ b/integration/radvd/radvd_test.go
@@ -29,8 +29,10 @@ import (
 func TestRouterAdvertisement(t *testing.T) {
 	const ns = "ns2" // name of the network namespace to use for this test
 
-	if err := exec.Command("ip", "netns", "add", ns).Run(); err != nil {
-		t.Fatalf("ip netns add %s: %v", ns, err)
+	add := exec.Command("ip", "netns", "add", ns)
+	add.Stderr = os.Stderr
+	if err := add.Run(); err != nil {
+		t.Fatalf("%v: %v", add.Args, err)
 	}
 	defer exec.Command("ip", "netns", "delete", ns).Run()