diff --git a/go/vt/grpcclient/client_auth_static.go b/go/vt/grpcclient/client_auth_static.go
index 2770c96ae0b..4b70680121e 100644
--- a/go/vt/grpcclient/client_auth_static.go
+++ b/go/vt/grpcclient/client_auth_static.go
@@ -21,6 +21,7 @@ import (
 	"flag"
 	"os"
 	"sync"
+	"errors"
 
 	"context"