diff --git a/api/BUILD.gn b/api/BUILD.gn
index 58b39d5a68..c5f38287ee 100644
--- a/api/BUILD.gn
+++ b/api/BUILD.gn
@@ -688,6 +688,7 @@ if (rtc_include_tests) {
         "//third_party/abseil-cpp/absl/flags:flag",
         "//third_party/abseil-cpp/absl/flags:parse",
         "//third_party/abseil-cpp/absl/strings",
+        "//third_party/abseil-cpp/absl/types:optional",
       ]
     }
   }
diff --git a/api/test/neteq_simulator_factory.cc b/api/test/neteq_simulator_factory.cc
index fe056be4ea..ea5be8517d 100644
--- a/api/test/neteq_simulator_factory.cc
+++ b/api/test/neteq_simulator_factory.cc
@@ -37,6 +37,7 @@ std::unique_ptr<NetEqSimulator> NetEqSimulatorFactory::CreateSimulatorFromFile(
   config.initial_dummy_packets = simulation_config.initial_dummy_packets;
   config.skip_get_audio_events = simulation_config.skip_get_audio_events;
   config.field_trial_string = simulation_config.field_trial_string;
+  config.output_audio_filename = simulation_config.output_audio_filename;
   return factory_->InitializeTestFromFile(
       std::string(event_log_filename), simulation_config.neteq_factory, config);
 }
diff --git a/api/test/neteq_simulator_factory.h b/api/test/neteq_simulator_factory.h
index 925b4f4c03..b3c77b1404 100644
--- a/api/test/neteq_simulator_factory.h
+++ b/api/test/neteq_simulator_factory.h
@@ -15,6 +15,7 @@
 #include <string>
 
 #include "absl/strings/string_view.h"
+#include "absl/types/optional.h"
 #include "api/neteq/neteq_factory.h"
 #include "api/test/neteq_simulator.h"
 
@@ -41,6 +42,8 @@ class NetEqSimulatorFactory {
     int skip_get_audio_events = 0;
     // A WebRTC field trial string to be used during the simulation.
     std::string field_trial_string;
+    // A filename for the generated output audio file.
+    absl::optional<std::string> output_audio_filename;
     // A custom NetEqFactory can be used.
     NetEqFactory* neteq_factory = nullptr;
   };