diff --git a/credentials/credentials.go b/credentials/credentials.go
index 8189ca76..217ef82f 100644
--- a/credentials/credentials.go
+++ b/credentials/credentials.go
@@ -80,7 +80,7 @@ type ProtocolInfo struct {
 
 // AuthInfo defines the common interface for the auth information the users are interested in.
 type AuthInfo interface {
-	Type() string
+	AuthType() string
 }
 
 type authInfoKey struct{}
@@ -118,7 +118,7 @@ type TLSInfo struct {
 	state tls.ConnectionState
 }
 
-func (t TLSInfo) Type() string {
+func (t TLSInfo) AuthType() string {
 	return "tls"
 }
 
diff --git a/test/end2end_test.go b/test/end2end_test.go
index d2368f84..35b40ec0 100644
--- a/test/end2end_test.go
+++ b/test/end2end_test.go
@@ -120,7 +120,7 @@ func (s *testServer) UnaryCall(ctx context.Context, in *testpb.SimpleRequest) (*
 		var authType string
 		switch info := authInfo.(type) {
 		case credentials.TLSInfo:
-			authType = info.Type()
+			authType = info.AuthType()
 		default:
 			grpclog.Fatalf("Unknown AuthInfo type")
 		}