diff --git a/api/video_codecs/BUILD.gn b/api/video_codecs/BUILD.gn
index 108e11cb69..a6640678d9 100644
--- a/api/video_codecs/BUILD.gn
+++ b/api/video_codecs/BUILD.gn
@@ -34,6 +34,7 @@ rtc_source_set("scalability_mode_helper") {
   deps = [
     ":scalability_mode",
     "../../modules/video_coding/svc:scalability_mode_util",
+    "../../rtc_base/system:rtc_export",
     "//third_party/abseil-cpp/absl/strings:string_view",
   ]
 }
diff --git a/api/video_codecs/scalability_mode_helper.h b/api/video_codecs/scalability_mode_helper.h
index d48d45bc65..bc10bc5611 100644
--- a/api/video_codecs/scalability_mode_helper.h
+++ b/api/video_codecs/scalability_mode_helper.h
@@ -15,22 +15,23 @@
 
 #include "absl/strings/string_view.h"
 #include "api/video_codecs/scalability_mode.h"
+#include "rtc_base/system/rtc_export.h"
 
 namespace webrtc {
 
 // Returns the number of spatial layers from the `scalability_mode_string`
 // or nullopt if the given mode is unknown.
-std::optional<int> ScalabilityModeStringToNumSpatialLayers(
+RTC_EXPORT std::optional<int> ScalabilityModeStringToNumSpatialLayers(
     absl::string_view scalability_mode_string);
 
 // Returns the number of temporal layers from the `scalability_mode_string`
 // or nullopt if the given mode is unknown.
-std::optional<int> ScalabilityModeStringToNumTemporalLayers(
+RTC_EXPORT std::optional<int> ScalabilityModeStringToNumTemporalLayers(
     absl::string_view scalability_mode_string);
 
 // Convert the `scalability_mode_string` to the scalability mode enum value
 // or nullopt if the given mode is unknown.
-std::optional<ScalabilityMode> ScalabilityModeStringToEnum(
+RTC_EXPORT std::optional<ScalabilityMode> ScalabilityModeStringToEnum(
     absl::string_view scalability_mode_string);
 
 }  // namespace webrtc