diff --git a/webrtc/sdk/objc/Framework/Classes/RTCFieldTrials.mm b/webrtc/sdk/objc/Framework/Classes/RTCFieldTrials.mm
index ac3a4b3e48..3057a17aed 100644
--- a/webrtc/sdk/objc/Framework/Classes/RTCFieldTrials.mm
+++ b/webrtc/sdk/objc/Framework/Classes/RTCFieldTrials.mm
@@ -20,6 +20,8 @@ static NSString * const kRTCEnableImprovedBitrateEstimateString =
     @"WebRTC-ImprovedBitrateEstimate/Enabled/";
 static NSString * const kRTCEnableAudioSendSideBweString =
     @"WebRTC-Audio-SendSideBwe/Enabled/";
+static NSString * const kRTCEnableFlexFec03String =
+    @"WebRTC-FlexFEC-03/Enabled/";
 static std::unique_ptr<char[]> gFieldTrialInitString;
 
 void RTCInitFieldTrials(RTCFieldTrialOptions options) {
@@ -30,6 +32,9 @@ void RTCInitFieldTrials(RTCFieldTrialOptions options) {
   if (options & RTCFieldTrialOptionsAudioSendSideBwe) {
     [fieldTrialInitString appendString:kRTCEnableAudioSendSideBweString];
   }
+  if (options & RTCFieldTrialOptionsFlexFec03) {
+    [fieldTrialInitString appendString:kRTCEnableFlexFec03String];
+  }
   size_t len = fieldTrialInitString.length + 1;
   gFieldTrialInitString.reset(new char[len]);
   if (![fieldTrialInitString getCString:gFieldTrialInitString.get()
diff --git a/webrtc/sdk/objc/Framework/Headers/WebRTC/RTCFieldTrials.h b/webrtc/sdk/objc/Framework/Headers/WebRTC/RTCFieldTrials.h
index c745ecf07e..504ff7a885 100644
--- a/webrtc/sdk/objc/Framework/Headers/WebRTC/RTCFieldTrials.h
+++ b/webrtc/sdk/objc/Framework/Headers/WebRTC/RTCFieldTrials.h
@@ -16,6 +16,7 @@ typedef NS_OPTIONS(NSUInteger, RTCFieldTrialOptions) {
   RTCFieldTrialOptionsNone = 0,
   RTCFieldTrialOptionsImprovedBitrateEstimate = 1 << 0,
   RTCFieldTrialOptionsAudioSendSideBwe = 1 << 1,
+  RTCFieldTrialOptionsFlexFec03 = 1 << 2,
 };
 
 /** Must be called before any other call into WebRTC. See: