From aeb32eca53bf1d1b352e206dd72b8083376df6dd Mon Sep 17 00:00:00 2001
From: Craig Tiller <craig.tiller@gmail.com>
Date: Fri, 18 Jun 2021 14:38:48 -0700
Subject: [PATCH] compile fix

---
 test/cpp/interop/grpclb_fallback_test.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/test/cpp/interop/grpclb_fallback_test.cc b/test/cpp/interop/grpclb_fallback_test.cc
index caa86fc3117..c66daadc74b 100644
--- a/test/cpp/interop/grpclb_fallback_test.cc
+++ b/test/cpp/interop/grpclb_fallback_test.cc
@@ -151,7 +151,7 @@ void TcpUserTimeoutDestroy(grpc_socket_mutator* mutator) { gpr_free(mutator); }
 
 const grpc_socket_mutator_vtable kTcpUserTimeoutMutatorVtable =
     grpc_socket_mutator_vtable{TcpUserTimeoutMutateFd, TcpUserTimeoutCompare,
-                               TcpUserTimeoutDestroy};
+                               TcpUserTimeoutDestroy, nullptr};
 
 std::unique_ptr<TestService::Stub> CreateFallbackTestStub() {
   grpc::ChannelArguments channel_args;