diff --git a/servlet/src/jettyTest/java/io/grpc/servlet/JettyInteropTest.java b/servlet/src/jettyTest/java/io/grpc/servlet/JettyInteropTest.java
index ebdf029fe2..9b54eb5a0d 100644
--- a/servlet/src/jettyTest/java/io/grpc/servlet/JettyInteropTest.java
+++ b/servlet/src/jettyTest/java/io/grpc/servlet/JettyInteropTest.java
@@ -83,10 +83,9 @@ public class JettyInteropTest extends AbstractInteropTest {
 
   @Override
   protected ManagedChannelBuilder<?> createChannelBuilder() {
-    NettyChannelBuilder builder =
-            (NettyChannelBuilder) ManagedChannelBuilder.forAddress(HOST, port)
-                    .usePlaintext()
-                    .maxInboundMessageSize(AbstractInteropTest.MAX_MESSAGE_SIZE);
+    NettyChannelBuilder builder = NettyChannelBuilder.forAddress(HOST, port)
+                                  .usePlaintext()
+                                  .maxInboundMessageSize(AbstractInteropTest.MAX_MESSAGE_SIZE);
     InternalNettyChannelBuilder.setStatsEnabled(builder, false);
     builder.intercept(createCensusStatsClientInterceptor());
     return builder;
diff --git a/servlet/src/tomcatTest/java/io/grpc/servlet/TomcatInteropTest.java b/servlet/src/tomcatTest/java/io/grpc/servlet/TomcatInteropTest.java
index f28a741928..1422b5388f 100644
--- a/servlet/src/tomcatTest/java/io/grpc/servlet/TomcatInteropTest.java
+++ b/servlet/src/tomcatTest/java/io/grpc/servlet/TomcatInteropTest.java
@@ -94,10 +94,9 @@ public class TomcatInteropTest extends AbstractInteropTest {
 
   @Override
   protected ManagedChannelBuilder<?> createChannelBuilder() {
-    NettyChannelBuilder builder =
-            (NettyChannelBuilder) ManagedChannelBuilder.forAddress(HOST, port)
-                    .usePlaintext()
-                    .maxInboundMessageSize(AbstractInteropTest.MAX_MESSAGE_SIZE);
+    NettyChannelBuilder builder = NettyChannelBuilder.forAddress(HOST, port)
+                                  .usePlaintext()
+                                  .maxInboundMessageSize(AbstractInteropTest.MAX_MESSAGE_SIZE);
     InternalNettyChannelBuilder.setStatsEnabled(builder, false);
     builder.intercept(createCensusStatsClientInterceptor());
     return builder;
diff --git a/servlet/src/undertowTest/java/io/grpc/servlet/UndertowInteropTest.java b/servlet/src/undertowTest/java/io/grpc/servlet/UndertowInteropTest.java
index 600400b14b..b8be018664 100644
--- a/servlet/src/undertowTest/java/io/grpc/servlet/UndertowInteropTest.java
+++ b/servlet/src/undertowTest/java/io/grpc/servlet/UndertowInteropTest.java
@@ -111,7 +111,7 @@ public class UndertowInteropTest extends AbstractInteropTest {
 
   @Override
   protected ManagedChannelBuilder<?> createChannelBuilder() {
-    NettyChannelBuilder builder = (NettyChannelBuilder) ManagedChannelBuilder
+    NettyChannelBuilder builder = NettyChannelBuilder
             .forAddress(HOST, port)
             .usePlaintext()
             .maxInboundMessageSize(AbstractInteropTest.MAX_MESSAGE_SIZE);