diff --git a/internal/apmhostutil/container_linux.go b/internal/apmhostutil/container_linux.go
index 7f96d9e94..4ce164405 100644
--- a/internal/apmhostutil/container_linux.go
+++ b/internal/apmhostutil/container_linux.go
@@ -131,7 +131,9 @@ func readCgroupContainerInfo(r io.Reader) (*model.Container, *model.Kubernetes,
 			hostname, _ := os.Hostname()
 			uid := match[1]
 			if uid == "" {
-				uid = match[2]
+				// Systemd cgroup driver is being used,
+				// so we need to unescape '_' back to '-'.
+				uid = strings.Replace(match[2], "_", "-", -1)
 			}
 			kubernetes = &model.Kubernetes{
 				Pod: &model.KubernetesPod{
diff --git a/internal/apmhostutil/container_linux_test.go b/internal/apmhostutil/container_linux_test.go
index a181a273d..6c52f2402 100644
--- a/internal/apmhostutil/container_linux_test.go
+++ b/internal/apmhostutil/container_linux_test.go
@@ -139,7 +139,7 @@ func TestCgroupContainerInfoKubernetesSystemd(t *testing.T) {
 	assert.Equal(t, &model.Container{ID: "2227daf62df6694645fee5df53c1f91271546a9560e8600a525690ae252b7f63"}, container)
 	assert.Equal(t, &model.Kubernetes{
 		Pod: &model.KubernetesPod{
-			UID:  "90d81341_92de_11e7_8cf2_507b9d4141fa",
+			UID:  "90d81341-92de-11e7-8cf2-507b9d4141fa",
 			Name: hostname,
 		},
 	}, kubernetes)