diff --git a/pc/rtp_transceiver.cc b/pc/rtp_transceiver.cc
index 9e62f95dd8..d11e04b277 100644
--- a/pc/rtp_transceiver.cc
+++ b/pc/rtp_transceiver.cc
@@ -485,7 +485,7 @@ RTCError RtpTransceiver::SetOfferedRtpHeaderExtensions(
         header_extensions_to_offer_.begin(), header_extensions_to_offer_.end(),
         [&entry](const auto& offered) { return entry.uri == offered.uri; });
     if (it == header_extensions_to_offer_.end()) {
-      return RTCError(RTCErrorType::INVALID_PARAMETER,
+      return RTCError(RTCErrorType::UNSUPPORTED_PARAMETER,
                       "Attempted to modify an unoffered extension.");
     }
 
diff --git a/pc/rtp_transceiver_unittest.cc b/pc/rtp_transceiver_unittest.cc
index 91e1aa3cee..7b72620305 100644
--- a/pc/rtp_transceiver_unittest.cc
+++ b/pc/rtp_transceiver_unittest.cc
@@ -186,7 +186,7 @@ TEST_F(RtpTransceiverTestForHeaderExtensions, RejectsUnsupportedExtension) {
       {RtpHeaderExtensionCapability("uri3", 1,
                                     RtpTransceiverDirection::kSendRecv)});
   EXPECT_THAT(transceiver_.SetOfferedRtpHeaderExtensions(modified_extensions),
-              Property(&RTCError::type, RTCErrorType::INVALID_PARAMETER));
+              Property(&RTCError::type, RTCErrorType::UNSUPPORTED_PARAMETER));
   EXPECT_EQ(transceiver_.HeaderExtensionsToOffer(), extensions_);
 }