diff --git a/media/engine/payload_type_mapper.cc b/media/engine/payload_type_mapper.cc
index 4c46975997..cbc0a5340d 100644
--- a/media/engine/payload_type_mapper.cc
+++ b/media/engine/payload_type_mapper.cc
@@ -72,6 +72,8 @@ PayloadTypeMapper::PayloadTypeMapper()
              {{kCodecParamMinPTime, "10"},
               {kCodecParamUseInbandFec, kParamValueTrue}}},
             111},
+           // RED for opus is assigned in the lower range, starting at the top.
+           {{kRedCodecName, 48000, 2}, 63},
            // TODO(solenberg): Remove the hard coded 16k,32k,48k DTMF once we
            // assign payload types dynamically for send side as well.
            {{kDtmfCodecName, 48000, 1}, 110},
diff --git a/media/engine/payload_type_mapper_unittest.cc b/media/engine/payload_type_mapper_unittest.cc
index 9361f76116..9c29827fa9 100644
--- a/media/engine/payload_type_mapper_unittest.cc
+++ b/media/engine/payload_type_mapper_unittest.cc
@@ -58,6 +58,7 @@ TEST_F(PayloadTypeMapperTest, WebRTCPayloadTypes) {
                       48000,
                       2,
                       {{"minptime", "10"}, {"useinbandfec", "1"}}}));
+  EXPECT_EQ(63, mapper_.FindMappingFor({kRedCodecName, 48000, 2}));
   // TODO(solenberg): Remove 16k, 32k, 48k DTMF checks once these payload types
   // are dynamically assigned.
   EXPECT_EQ(110, mapper_.FindMappingFor({kDtmfCodecName, 48000, 1}));