diff --git a/pc/peer_connection_simulcast_unittest.cc b/pc/peer_connection_simulcast_unittest.cc
index 41e2c81100..f47ed3808b 100644
--- a/pc/peer_connection_simulcast_unittest.cc
+++ b/pc/peer_connection_simulcast_unittest.cc
@@ -1557,6 +1557,43 @@ TEST_F(PeerConnectionSimulcastWithMediaFlowTests,
   EXPECT_FALSE(parameters.encodings[2].scalability_mode.has_value());
 }
 
+TEST_F(PeerConnectionSimulcastWithMediaFlowTests,
+       SendingThreeEncodings_VP9_LegacySVC_AllLayersInactive) {
+  rtc::scoped_refptr<PeerConnectionTestWrapper> local_pc_wrapper = CreatePc();
+  rtc::scoped_refptr<PeerConnectionTestWrapper> remote_pc_wrapper = CreatePc();
+  ExchangeIceCandidates(local_pc_wrapper, remote_pc_wrapper);
+
+  std::vector<SimulcastLayer> layers =
+      CreateLayers({"f", "h", "q"}, /*active=*/true);
+  rtc::scoped_refptr<RtpTransceiverInterface> transceiver =
+      AddTransceiverWithSimulcastLayers(local_pc_wrapper, remote_pc_wrapper,
+                                        layers);
+  std::vector<RtpCodecCapability> codecs =
+      GetCapabilitiesAndRestrictToCodec(local_pc_wrapper, "VP9");
+  transceiver->SetCodecPreferences(codecs);
+
+  // Legacy SVC mode and all layers inactive.
+  rtc::scoped_refptr<RtpSenderInterface> sender = transceiver->sender();
+  RtpParameters parameters = sender->GetParameters();
+  ASSERT_EQ(parameters.encodings.size(), 3u);
+  parameters.encodings[0].active = false;
+  parameters.encodings[1].active = false;
+  parameters.encodings[2].active = false;
+  sender->SetParameters(parameters);
+
+  NegotiateWithSimulcastTweaks(local_pc_wrapper, remote_pc_wrapper, layers);
+  local_pc_wrapper->WaitForConnection();
+  remote_pc_wrapper->WaitForConnection();
+
+  // Ensure no media is flowing (1 second should be enough).
+  rtc::Thread::Current()->SleepMs(1000);
+  rtc::scoped_refptr<const RTCStatsReport> report = GetStats(local_pc_wrapper);
+  std::vector<const RTCOutboundRtpStreamStats*> outbound_rtps =
+      report->GetStatsOfType<RTCOutboundRtpStreamStats>();
+  ASSERT_THAT(outbound_rtps, SizeIs(1u));
+  EXPECT_EQ(*outbound_rtps[0]->bytes_sent, 0u);
+}
+
 TEST_F(PeerConnectionSimulcastWithMediaFlowTests,
        SendingThreeEncodings_VP9_StandardL1T3_AllLayersInactive) {
   rtc::scoped_refptr<PeerConnectionTestWrapper> local_pc_wrapper = CreatePc();