diff --git a/interop-testing/src/main/java/io/grpc/testing/integration/StressTestClient.java b/interop-testing/src/main/java/io/grpc/testing/integration/StressTestClient.java
index 8fb48a3aba..f2c4eec184 100644
--- a/interop-testing/src/main/java/io/grpc/testing/integration/StressTestClient.java
+++ b/interop-testing/src/main/java/io/grpc/testing/integration/StressTestClient.java
@@ -204,7 +204,7 @@ public class StressTestClient {
               + "\n  --use_test_ca=true|false       Whether to trust our fake CA. Requires"
               + " --use_tls=true"
               + "\n                                 to have effect. Default: " + c.useTestCa
-              + "\n  --custom_credentials_type   Custom credentials type to use. Default "
+              + "\n  --custom_credentials_type      Custom credentials type to use. Default "
               + c.customCredentialsType
               + "\n  --test_duration_secs=SECONDS   '-1' for no limit. Default: " + c.durationSecs
               + "\n  --num_channels_per_server=INT  Number of connections to each server address."
diff --git a/interop-testing/src/test/java/io/grpc/testing/integration/StressTestClientTest.java b/interop-testing/src/test/java/io/grpc/testing/integration/StressTestClientTest.java
index d4a44222d1..301c7e56f0 100644
--- a/interop-testing/src/test/java/io/grpc/testing/integration/StressTestClientTest.java
+++ b/interop-testing/src/test/java/io/grpc/testing/integration/StressTestClientTest.java
@@ -19,6 +19,7 @@ package io.grpc.testing.integration;
 import static com.google.common.collect.Sets.newHashSet;
 import static java.util.Collections.singletonList;
 import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNull;
 import static org.junit.Assert.assertTrue;
 
 import com.google.common.collect.ImmutableList;
@@ -65,6 +66,8 @@ public class StressTestClientTest {
     assertEquals(1, client.channelsPerServer());
     assertEquals(1, client.stubsPerChannel());
     assertEquals(8081, client.metricsPort());
+    assertEquals(-1, client.metricsLogRateSecs());
+    assertNull((client.customCredentialsType()));
   }
 
   @Test