diff --git a/test/e2e_node/util.go b/test/e2e_node/util.go
index cd663be42eb..a7b636cd164 100644
--- a/test/e2e_node/util.go
+++ b/test/e2e_node/util.go
@@ -378,7 +378,7 @@ func findRunningKubletServiceName() string {
 	framework.ExpectNoError(err)
 	regex := regexp.MustCompile("(kubelet-\\w+)")
 	matches := regex.FindStringSubmatch(string(stdout))
-	framework.ExpectNotEqual(len(matches), 0)
+	framework.ExpectNotEqual(len(matches), 0, "Found more than one kubelet service running: %q", stdout)
 	kubeletServiceName := matches[0]
 	framework.Logf("Get running kubelet with systemctl: %v, %v", string(stdout), kubeletServiceName)
 	return kubeletServiceName