diff --git a/stub/src/test/java/io/grpc/stub/AbstractAsyncStubTest.java b/stub/src/test/java/io/grpc/stub/AbstractAsyncStubTest.java
index 3cb13e9b36..0277b7a66c 100644
--- a/stub/src/test/java/io/grpc/stub/AbstractAsyncStubTest.java
+++ b/stub/src/test/java/io/grpc/stub/AbstractAsyncStubTest.java
@@ -27,7 +27,10 @@ import io.grpc.stub.AbstractFutureStubTest.NoopFutureStub;
 import io.grpc.stub.AbstractStub.StubFactory;
 import io.grpc.stub.ClientCalls.StubType;
 import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
 
+@RunWith(JUnit4.class)
 public class AbstractAsyncStubTest extends BaseAbstractStubTest<NoopAsyncStub> {
 
   @Override
diff --git a/stub/src/test/java/io/grpc/stub/AbstractFutureStubTest.java b/stub/src/test/java/io/grpc/stub/AbstractFutureStubTest.java
index c7afe3f77b..0c0fdaac91 100644
--- a/stub/src/test/java/io/grpc/stub/AbstractFutureStubTest.java
+++ b/stub/src/test/java/io/grpc/stub/AbstractFutureStubTest.java
@@ -27,7 +27,10 @@ import io.grpc.stub.AbstractFutureStubTest.NoopFutureStub;
 import io.grpc.stub.AbstractStub.StubFactory;
 import io.grpc.stub.ClientCalls.StubType;
 import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
 
+@RunWith(JUnit4.class)
 public class AbstractFutureStubTest extends BaseAbstractStubTest<NoopFutureStub> {
 
   @Override