diff --git a/api/audio/echo_canceller3_config.h b/api/audio/echo_canceller3_config.h
index 53408e4de4..a505625538 100644
--- a/api/audio/echo_canceller3_config.h
+++ b/api/audio/echo_canceller3_config.h
@@ -90,9 +90,6 @@ struct RTC_EXPORT EchoCanceller3Config {
     bool enable_coarse_filter_output_usage = true;
     bool use_linear_filter = true;
     bool export_linear_aec_output = false;
-    // Deprecated.
-    // TODO(peah): Remove.
-    bool use_legacy_filter_naming = false;
   } filter;
 
   struct Erle {
diff --git a/api/audio/echo_canceller3_config_json.cc b/api/audio/echo_canceller3_config_json.cc
index 088c43439b..f5c1249674 100644
--- a/api/audio/echo_canceller3_config_json.cc
+++ b/api/audio/echo_canceller3_config_json.cc
@@ -230,8 +230,6 @@ void Aec3ConfigFromJsonString(absl::string_view json_string,
     ReadParam(section, "use_linear_filter", &cfg.filter.use_linear_filter);
     ReadParam(section, "export_linear_aec_output",
               &cfg.filter.export_linear_aec_output);
-    ReadParam(section, "use_legacy_filter_naming",
-              &cfg.filter.use_legacy_filter_naming);
   }
 
   if (rtc::GetValueFromJsonObject(aec3_root, "erle", &section)) {
@@ -508,9 +506,7 @@ std::string Aec3ConfigToJsonString(const EchoCanceller3Config& config) {
   ost << "\"use_linear_filter\": "
       << (config.filter.use_linear_filter ? "true" : "false") << ",";
   ost << "\"export_linear_aec_output\": "
-      << (config.filter.export_linear_aec_output ? "true" : "false") << ",";
-  ost << "\"use_legacy_filter_naming\": "
-      << (config.filter.use_legacy_filter_naming ? "true" : "false");
+      << (config.filter.export_linear_aec_output ? "true" : "false");
 
   ost << "},";