1 files changed, 3 insertions, 2 deletions
diff --git a/src/core/ext/filters/client_channel/lb_policy/round_robin/round_robin.cc b/src/core/ext/filters/client_channel/lb_policy/round_robin/round_robin.cc
index fea84331d8..c730b3bd2b 100644
--- a/src/core/ext/filters/client_channel/lb_policy/round_robin/round_robin.cc
+++ b/src/core/ext/filters/client_channel/lb_policy/round_robin/round_robin.cc
@@ -36,6 +36,7 @@
 #include "src/core/ext/filters/client_channel/subchannel_index.h"
 #include "src/core/lib/channel/channel_args.h"
 #include "src/core/lib/debug/trace.h"
+#include "src/core/lib/gprpp/mutex_lock.h"
 #include "src/core/lib/gprpp/ref_counted_ptr.h"
 #include "src/core/lib/iomgr/combiner.h"
 #include "src/core/lib/iomgr/sockaddr_utils.h"
@@ -400,7 +401,7 @@ bool RoundRobin::PickLocked(PickState* pick, grpc_error** error) {
 
 void RoundRobin::FillChildRefsForChannelz(
     ChildRefsList* child_subchannels_to_fill, ChildRefsList* ignored) {
-  mu_guard guard(&child_refs_mu_);
+  MutexLock lock(&child_refs_mu_);
   for (size_t i = 0; i < child_subchannels_.size(); ++i) {
     // TODO(ncteisen): implement a de dup loop that is not O(n^2). Might
     // have to implement lightweight set. For now, we don't care about
@@ -427,7 +428,7 @@ void RoundRobin::UpdateChildRefsLocked() {
     latest_pending_subchannel_list_->PopulateChildRefsList(&cs);
   }
   // atomically update the data that channelz will actually be looking at.
-  mu_guard guard(&child_refs_mu_);
+  MutexLock lock(&child_refs_mu_);
   child_subchannels_ = std::move(cs);
 }