diff --git a/api/transport/network_types.h b/api/transport/network_types.h
index e3880b9729..ad484ea800 100644
--- a/api/transport/network_types.h
+++ b/api/transport/network_types.h
@@ -31,7 +31,7 @@ struct StreamsConfig {
   StreamsConfig(const StreamsConfig&);
   ~StreamsConfig();
   Timestamp at_time = Timestamp::PlusInfinity();
-  bool requests_alr_probing = false;
+  absl::optional<bool> requests_alr_probing;
   absl::optional<double> pacing_factor;
   absl::optional<DataRate> min_pacing_rate;
   absl::optional<DataRate> max_padding_rate;
diff --git a/modules/congestion_controller/goog_cc/goog_cc_network_control.cc b/modules/congestion_controller/goog_cc/goog_cc_network_control.cc
index f0eef4b9af..b996e34ade 100644
--- a/modules/congestion_controller/goog_cc/goog_cc_network_control.cc
+++ b/modules/congestion_controller/goog_cc/goog_cc_network_control.cc
@@ -256,8 +256,10 @@ NetworkControlUpdate GoogCcNetworkController::OnProcessInterval(
                                  initial_config_->constraints.starting_rate);
     update.pacer_config = GetPacingRates(msg.at_time);
 
-    probe_controller_->EnablePeriodicAlrProbing(
-        initial_config_->stream_based_config.requests_alr_probing);
+    if (initial_config_->stream_based_config.requests_alr_probing) {
+      probe_controller_->EnablePeriodicAlrProbing(
+          *initial_config_->stream_based_config.requests_alr_probing);
+    }
     absl::optional<DataRate> total_bitrate =
         initial_config_->stream_based_config.max_total_allocated_bitrate;
     if (total_bitrate) {
@@ -345,7 +347,9 @@ NetworkControlUpdate GoogCcNetworkController::OnSentPacket(
 NetworkControlUpdate GoogCcNetworkController::OnStreamsConfig(
     StreamsConfig msg) {
   NetworkControlUpdate update;
-  probe_controller_->EnablePeriodicAlrProbing(msg.requests_alr_probing);
+  if (msg.requests_alr_probing) {
+    probe_controller_->EnablePeriodicAlrProbing(*msg.requests_alr_probing);
+  }
   if (msg.max_total_allocated_bitrate &&
       *msg.max_total_allocated_bitrate != max_total_allocated_bitrate_) {
     update.probe_cluster_configs =