s/NULL/nullptr
diff --git a/src/core/ext/filters/client_channel/lb_policy/grpclb/client_load_reporting_filter.cc b/src/core/ext/filters/client_channel/lb_policy/grpclb/client_load_reporting_filter.cc
index d93a9c3..6d9fada 100644
--- a/src/core/ext/filters/client_channel/lb_policy/grpclb/client_load_reporting_filter.cc
+++ b/src/core/ext/filters/client_channel/lb_policy/grpclb/client_load_reporting_filter.cc
@@ -72,8 +72,8 @@
                                   const grpc_call_element_args* args) {
   call_data* calld = (call_data*)elem->call_data;
   // Get stats object from context and take a ref.
-  GPR_ASSERT(args->context != NULL);
-  GPR_ASSERT(args->context[GRPC_GRPCLB_CLIENT_STATS].value != NULL);
+  GPR_ASSERT(args->context != nullptr);
+  GPR_ASSERT(args->context[GRPC_GRPCLB_CLIENT_STATS].value != nullptr);
   calld->client_stats = grpc_grpclb_client_stats_ref(
       (grpc_grpclb_client_stats*)args->context[GRPC_GRPCLB_CLIENT_STATS].value);
   // Record call started.