diff --git a/api/BUILD.gn b/api/BUILD.gn
index ab54a77f6a..48d377000f 100644
--- a/api/BUILD.gn
+++ b/api/BUILD.gn
@@ -486,6 +486,7 @@ rtc_library("audio_options_api") {
   deps = [
     ":array_view",
     "../rtc_base:stringutils",
+    "../rtc_base/system:rtc_export",
     "//third_party/abseil-cpp/absl/types:optional",
   ]
 }
diff --git a/api/audio/echo_canceller3_config_json.h b/api/audio/echo_canceller3_config_json.h
index 8973650f85..ecee9541c7 100644
--- a/api/audio/echo_canceller3_config_json.h
+++ b/api/audio/echo_canceller3_config_json.h
@@ -37,7 +37,8 @@ Aec3ConfigFromJsonString(absl::string_view json_string);
 
 // Encodes an Aec3 config in JSON format. Fields corresponds to substruct names,
 // with the addition that the top-level node is named "aec3".
-std::string Aec3ConfigToJsonString(const EchoCanceller3Config& config);
+RTC_EXPORT std::string Aec3ConfigToJsonString(
+    const EchoCanceller3Config& config);
 
 }  // namespace webrtc
 
diff --git a/api/audio_options.h b/api/audio_options.h
index aa2594c59d..b714998c6b 100644
--- a/api/audio_options.h
+++ b/api/audio_options.h
@@ -16,6 +16,7 @@
 #include <string>
 
 #include "absl/types/optional.h"
+#include "rtc_base/system/rtc_export.h"
 
 namespace cricket {
 
@@ -23,7 +24,7 @@ namespace cricket {
 // Used to be flags, but that makes it hard to selectively apply options.
 // We are moving all of the setting of options to structs like this,
 // but some things currently still use flags.
-struct AudioOptions {
+struct RTC_EXPORT AudioOptions {
   AudioOptions();
   ~AudioOptions();
   void SetAll(const AudioOptions& change);
diff --git a/api/peer_connection_interface.h b/api/peer_connection_interface.h
index d118e52270..72e20b9200 100644
--- a/api/peer_connection_interface.h
+++ b/api/peer_connection_interface.h
@@ -1339,7 +1339,8 @@ struct RTC_EXPORT PeerConnectionFactoryDependencies final {
 // of networking classes, it should use the alternate
 // CreatePeerConnectionFactory method which accepts threads as input, and use
 // the CreatePeerConnection version that takes a PortAllocator as an argument.
-class PeerConnectionFactoryInterface : public rtc::RefCountInterface {
+class RTC_EXPORT PeerConnectionFactoryInterface
+    : public rtc::RefCountInterface {
  public:
   class Options {
    public:
diff --git a/media/BUILD.gn b/media/BUILD.gn
index 7d4056a78f..39deaa3052 100644
--- a/media/BUILD.gn
+++ b/media/BUILD.gn
@@ -370,6 +370,7 @@ rtc_library("rtc_media_engine_defaults") {
     "../api/video_codecs:builtin_video_encoder_factory",
     "../modules/audio_processing:api",
     "../rtc_base:checks",
+    "../rtc_base/system:rtc_export",
   ]
 }
 
diff --git a/media/engine/webrtc_media_engine_defaults.h b/media/engine/webrtc_media_engine_defaults.h
index c61d0696de..16b1d462e3 100644
--- a/media/engine/webrtc_media_engine_defaults.h
+++ b/media/engine/webrtc_media_engine_defaults.h
@@ -12,11 +12,12 @@
 #define MEDIA_ENGINE_WEBRTC_MEDIA_ENGINE_DEFAULTS_H_
 
 #include "media/engine/webrtc_media_engine.h"
+#include "rtc_base/system/rtc_export.h"
 
 namespace webrtc {
 
 // Sets required but null dependencies with default factories.
-void SetMediaEngineDefaults(cricket::MediaEngineDependencies* deps);
+RTC_EXPORT void SetMediaEngineDefaults(cricket::MediaEngineDependencies* deps);
 
 }  // namespace webrtc