diff --git a/cluster/gce/gci/credential-provider/main.go b/cluster/gce/gci/credential-provider/main.go
index 29b1c89db39..79215a4e2ae 100644
--- a/cluster/gce/gci/credential-provider/main.go
+++ b/cluster/gce/gci/credential-provider/main.go
@@ -30,20 +30,23 @@ import (
 	credentialproviderv1alpha1 "k8s.io/kubelet/pkg/apis/credentialprovider/v1alpha1"
 )
 
+const metadataTokenEndpoint = "http://metadata.google.internal./computeMetadata/v1/instance/service-accounts/default/token"
+
 func main() {
-	if err := getCredentials(os.Stdout); err != nil {
+	if err := getCredentials(metadataTokenEndpoint, os.Stdin, os.Stdout); err != nil {
 		klog.Fatalf("failed to get credentials: %v", err)
 	}
 }
 
-func getCredentials(w io.Writer) error {
+func getCredentials(tokenEndpoint string, r io.Reader, w io.Writer) error {
 	provider := &provider{
 		client: &http.Client{
 			Timeout: 10 * time.Second,
 		},
+		tokenEndpoint: tokenEndpoint,
 	}
 
-	data, err := ioutil.ReadAll(os.Stdin)
+	data, err := ioutil.ReadAll(r)
 	if err != nil {
 		return err
 	}
diff --git a/cluster/gce/gci/credential-provider/provider.go b/cluster/gce/gci/credential-provider/provider.go
index 3ba61e0557a..caf0fde489f 100644
--- a/cluster/gce/gci/credential-provider/provider.go
+++ b/cluster/gce/gci/credential-provider/provider.go
@@ -29,8 +29,6 @@ import (
 )
 
 const (
-	metadataToken = "http://metadata.google.internal./computeMetadata/v1/instance/service-accounts/default/token"
-	metadataEmail = "http://metadata.google.internal./computeMetadata/v1/instance/service-accounts/default/email"
 	maxReadLength = 10 * 1 << 20 // 10MB
 )
 
@@ -57,7 +55,8 @@ type TokenBlob struct {
 }
 
 type provider struct {
-	client *http.Client
+	client        *http.Client
+	tokenEndpoint string
 }
 
 func (p *provider) Provide(image string) (map[string]credentialproviderv1alpha1.AuthConfig, error) {
@@ -91,7 +90,7 @@ func readURL(url string, client *http.Client) (body []byte, err error) {
 		return nil, err
 	}
 
-	rea.Header = &http.Header{
+	req.Header = http.Header{
 		"Metadata-Flavor": []string{"Google"},
 	}