diff --git a/test/cpp/interop/interop_client.cc b/test/cpp/interop/interop_client.cc
index 874510e54f7..e3510592468 100644
--- a/test/cpp/interop/interop_client.cc
+++ b/test/cpp/interop/interop_client.cc
@@ -57,8 +57,8 @@ const std::vector<int> response_stream_sizes = {31415, 9, 2653, 58979};
 const int kNumResponseMessages = 2000;
 const int kResponseMessageSize = 1030;
 const int kReceiveDelayMilliSeconds = 20;
-const int kLargeRequestSize = 314159;
-const int kLargeResponseSize = 271812;
+const int kLargeRequestSize = 271828;
+const int kLargeResponseSize = 314159;
 }  // namespace
 
 InteropClient::InteropClient(std::shared_ptr<ChannelInterface> channel)