diff --git a/test/e2e/cloud/gcp/node_lease.go b/test/e2e/cloud/gcp/node_lease.go
index e9d36ab6b16..0fd0bea94dd 100644
--- a/test/e2e/cloud/gcp/node_lease.go
+++ b/test/e2e/cloud/gcp/node_lease.go
@@ -45,7 +45,7 @@ var _ = SIGDescribe("[Disruptive]NodeLease", func() {
 		systemPods, err := e2epod.GetPodsInNamespace(c, ns, map[string]string{})
 		framework.ExpectNoError(err)
 		systemPodsNo = int32(len(systemPods))
-		if strings.Index(framework.TestContext.CloudConfig.NodeInstanceGroup, ",") >= 0 {
+		if strings.Contains(framework.TestContext.CloudConfig.NodeInstanceGroup, ",") {
 			framework.Failf("Test dose not support cluster setup with more than one MIG: %s", framework.TestContext.CloudConfig.NodeInstanceGroup)
 		} else {
 			group = framework.TestContext.CloudConfig.NodeInstanceGroup
diff --git a/test/e2e/cloud/gcp/resize_nodes.go b/test/e2e/cloud/gcp/resize_nodes.go
index c78e0e0b9d6..75d8b201af2 100644
--- a/test/e2e/cloud/gcp/resize_nodes.go
+++ b/test/e2e/cloud/gcp/resize_nodes.go
@@ -54,7 +54,7 @@ var _ = SIGDescribe("Nodes [Disruptive]", func() {
 		systemPods, err := e2epod.GetPodsInNamespace(c, ns, map[string]string{})
 		framework.ExpectNoError(err)
 		systemPodsNo = int32(len(systemPods))
-		if strings.Index(framework.TestContext.CloudConfig.NodeInstanceGroup, ",") >= 0 {
+		if strings.Contains(framework.TestContext.CloudConfig.NodeInstanceGroup, ",") {
 			framework.Failf("Test dose not support cluster setup with more than one MIG: %s", framework.TestContext.CloudConfig.NodeInstanceGroup)
 		} else {
 			group = framework.TestContext.CloudConfig.NodeInstanceGroup