diff --git a/plugins/main/loopback/loopback_test.go b/plugins/main/loopback/loopback_test.go
index cf10e1a6..9436e9a9 100644
--- a/plugins/main/loopback/loopback_test.go
+++ b/plugins/main/loopback/loopback_test.go
@@ -19,30 +19,21 @@ var _ = Describe("Loopback", func() {
 		networkNS   string
 		containerID string
 		command     *exec.Cmd
+		environ     []string
 	)
 
 	BeforeEach(func() {
 		command = exec.Command(pathToLoPlugin)
-
-		environ := os.Environ()
-
 		containerID = "some-container-id"
 		networkNS = makeNetworkNS(containerID)
 
-		cniEnvVars := []string{
-			fmt.Sprintf("CNI_COMMAND=%s", "ADD"),
+		environ = []string{
 			fmt.Sprintf("CNI_CONTAINERID=%s", containerID),
 			fmt.Sprintf("CNI_NETNS=%s", networkNS),
 			fmt.Sprintf("CNI_IFNAME=%s", "this is ignored"),
 			fmt.Sprintf("CNI_ARGS=%s", "none"),
 			fmt.Sprintf("CNI_PATH=%s", "/some/test/path"),
 		}
-
-		for _, v := range cniEnvVars {
-			environ = append(environ, v)
-		}
-
-		command.Env = environ
 		command.Stdin = strings.NewReader("this doesn't matter")
 	})
 
@@ -52,6 +43,8 @@ var _ = Describe("Loopback", func() {
 
 	Context("when given a network namespace", func() {
 		It("sets the lo device to UP", func() {
+			command.Env = append(environ, fmt.Sprintf("CNI_COMMAND=%s", "ADD"))
+
 			session, err := gexec.Start(command, GinkgoWriter, GinkgoWriter)
 			Expect(err).NotTo(HaveOccurred())
 
@@ -68,5 +61,25 @@ var _ = Describe("Loopback", func() {
 
 			Expect(lo.Flags & net.FlagUp).To(Equal(net.FlagUp))
 		})
+
+		It("sets the lo device to DOWN", func() {
+			command.Env = append(environ, fmt.Sprintf("CNI_COMMAND=%s", "DEL"))
+
+			session, err := gexec.Start(command, GinkgoWriter, GinkgoWriter)
+			Expect(err).NotTo(HaveOccurred())
+
+			Eventually(session).Should(gbytes.Say(``))
+			Eventually(session).Should(gexec.Exit(0))
+
+			var lo *net.Interface
+			err = ns.WithNetNSPath(networkNS, true, func(hostNS *os.File) error {
+				var err error
+				lo, err = net.InterfaceByName("lo")
+				return err
+			})
+			Expect(err).NotTo(HaveOccurred())
+
+			Expect(lo.Flags & net.FlagUp).NotTo(Equal(net.FlagUp))
+		})
 	})
 })