diff --git a/registry/proxy/proxyauth.go b/registry/proxy/proxyauth.go
index bdc5fee8e1e..adf60cb9c3f 100644
--- a/registry/proxy/proxyauth.go
+++ b/registry/proxy/proxyauth.go
@@ -12,24 +12,24 @@ import (
 
 const challengeHeader = "Docker-Distribution-Api-Version"
 
-type basicAuth struct {
+type userpass struct {
 	username string
 	password string
 }
 
-func (b basicAuth) Basic(u *url.URL) (string, string) {
-	return b.username, b.password
+func (u userpass) Basic(_ *url.URL) (string, string) {
+	return u.username, u.password
 }
 
-func (b basicAuth) RefreshToken(u *url.URL, service string) string {
+func (u userpass) RefreshToken(_ *url.URL, service string) string {
 	return ""
 }
 
-func (b basicAuth) SetRefreshToken(u *url.URL, service, token string) {
+func (u userpass) SetRefreshToken(_ *url.URL, service, token string) {
 }
 
 type credentials struct {
-	creds map[string]basicAuth
+	creds map[string]userpass
 }
 
 func (c credentials) Basic(u *url.URL) (string, string) {
@@ -45,7 +45,7 @@ func (c credentials) SetRefreshToken(u *url.URL, service, token string) {
 
 // configureAuth stores credentials for challenge responses
 func configureAuth(username, password, remoteURL string) (auth.CredentialStore, auth.CredentialStore, error) {
-	creds := map[string]basicAuth{}
+	creds := map[string]userpass{}
 
 	authURLs, err := getAuthURLs(remoteURL)
 	if err != nil {
@@ -54,13 +54,13 @@ func configureAuth(username, password, remoteURL string) (auth.CredentialStore,
 
 	for _, url := range authURLs {
 		dcontext.GetLogger(dcontext.Background()).Infof("Discovered token authentication URL: %s", url)
-		creds[url] = basicAuth{
+		creds[url] = userpass{
 			username: username,
 			password: password,
 		}
 	}
 
-	return credentials{creds: creds}, basicAuth{username: username, password: password}, nil
+	return credentials{creds: creds}, userpass{username: username, password: password}, nil
 }
 
 func getAuthURLs(remoteURL string) ([]string, error) {