diff --git a/gcloud-java-resourcemanager/src/main/java/com/google/gcloud/resourcemanager/ResourceManagerImpl.java b/gcloud-java-resourcemanager/src/main/java/com/google/gcloud/resourcemanager/ResourceManagerImpl.java
index 1ee247861d59..9ae8c976631b 100644
--- a/gcloud-java-resourcemanager/src/main/java/com/google/gcloud/resourcemanager/ResourceManagerImpl.java
+++ b/gcloud-java-resourcemanager/src/main/java/com/google/gcloud/resourcemanager/ResourceManagerImpl.java
@@ -37,7 +37,7 @@
 import java.util.Map;
 import java.util.concurrent.Callable;
 
-public class ResourceManagerImpl
+final class ResourceManagerImpl
     extends BaseService<ResourceManagerOptions> implements ResourceManager {
 
   private static final Interceptor EXCEPTION_HANDLER_INTERCEPTOR = new Interceptor() {