diff --git a/api/src/main/java/io/grpc/NameResolver.java b/api/src/main/java/io/grpc/NameResolver.java
index 463c44eea9..6e36db64a2 100644
--- a/api/src/main/java/io/grpc/NameResolver.java
+++ b/api/src/main/java/io/grpc/NameResolver.java
@@ -414,7 +414,7 @@ public abstract class NameResolver {
     private final ServiceConfigParser serviceConfigParser;
     @Nullable private final Executor executor;
 
-    Args(
+    private Args(
         Integer defaultPort,
         ProxyDetector proxyDetector,
         SynchronizationContext syncContext,