diff --git a/modules/rtp_rtcp/include/rtp_payload_registry.h b/modules/rtp_rtcp/include/rtp_payload_registry.h
index 942c4ff1e7..3393eb8dd4 100644
--- a/modules/rtp_rtcp/include/rtp_payload_registry.h
+++ b/modules/rtp_rtcp/include/rtp_payload_registry.h
@@ -52,8 +52,6 @@ class RTPPayloadRegistry {
 
   bool GetRtxSsrc(uint32_t* ssrc) const;
 
-  void SetRtxPayloadType(int payload_type, int associated_payload_type);
-
   bool IsRed(const RTPHeader& header) const;
 
   int GetPayloadTypeFrequency(uint8_t payload_type) const;
@@ -109,8 +107,6 @@ class RTPPayloadRegistry {
   int8_t last_received_payload_type_;
   int8_t last_received_media_payload_type_;
   bool rtx_;
-  // Mapping rtx_payload_type_map_[rtx] = associated.
-  std::map<int, int> rtx_payload_type_map_;
   uint32_t ssrc_rtx_;
   // Only warn once per payload type, if an RTX packet is received but
   // no associated payload type found in |rtx_payload_type_map_|.
diff --git a/modules/rtp_rtcp/source/rtp_payload_registry.cc b/modules/rtp_rtcp/source/rtp_payload_registry.cc
index 7f7b564fbf..25ecb2d424 100644
--- a/modules/rtp_rtcp/source/rtp_payload_registry.cc
+++ b/modules/rtp_rtcp/source/rtp_payload_registry.cc
@@ -283,18 +283,6 @@ bool RTPPayloadRegistry::GetRtxSsrc(uint32_t* ssrc) const {
   return rtx_;
 }
 
-void RTPPayloadRegistry::SetRtxPayloadType(int payload_type,
-                                           int associated_payload_type) {
-  rtc::CritScope cs(&crit_sect_);
-  if (payload_type < 0) {
-    RTC_LOG(LS_ERROR) << "Invalid RTX payload type: " << payload_type;
-    return;
-  }
-
-  rtx_payload_type_map_[payload_type] = associated_payload_type;
-  rtx_ = true;
-}
-
 bool RTPPayloadRegistry::IsRed(const RTPHeader& header) const {
   rtc::CritScope cs(&crit_sect_);
   auto it = payload_type_map_.find(header.payloadType);