diff --git a/modules/rtp_rtcp/source/rtp_generic_frame_descriptor_extension.h b/modules/rtp_rtcp/source/rtp_generic_frame_descriptor_extension.h
index 0d673e0601..5c1bc52fcd 100644
--- a/modules/rtp_rtcp/source/rtp_generic_frame_descriptor_extension.h
+++ b/modules/rtp_rtcp/source/rtp_generic_frame_descriptor_extension.h
@@ -19,6 +19,10 @@
 
 namespace webrtc {
 
+// TODO(bugs.webrtc.org/10243): Remove when downstream projects stop using
+// RtpGenericFrameDescriptorExtension.
+using RtpGenericFrameDescriptorExtension00 = RtpGenericFrameDescriptorExtension;
+
 class RtpGenericFrameDescriptorExtension {
  public:
   using value_type = RtpGenericFrameDescriptor;