diff --git a/registry/proxy/proxyregistry.go b/registry/proxy/proxyregistry.go
index 56818dabc..c63bc619f 100644
--- a/registry/proxy/proxyregistry.go
+++ b/registry/proxy/proxyregistry.go
@@ -203,7 +203,7 @@ func (r *remoteAuthChallenger) tryEstablishChallenges(ctx context.Context) error
 
 	remoteURL := r.remoteURL
 	remoteURL.Path = "/v2/"
-	challenges, err := r.cm.GetChallenges(r.remoteURL)
+	challenges, err := r.cm.GetChallenges(remoteURL)
 	if err != nil {
 		return err
 	}