diff --git a/media/engine/payload_type_mapper.cc b/media/engine/payload_type_mapper.cc
index cbc0a53..c63d1d7 100644
--- a/media/engine/payload_type_mapper.cc
+++ b/media/engine/payload_type_mapper.cc
@@ -73,7 +73,12 @@
               {kCodecParamUseInbandFec, kParamValueTrue}}},
             111},
            // RED for opus is assigned in the lower range, starting at the top.
-           {{kRedCodecName, 48000, 2}, 63},
+           // Note that the FMTP refers to the opus payload type.
+           {{kRedCodecName,
+             48000,
+             2,
+             {{kCodecParamNotInNameValueFormat, "111/111"}}},
+            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 9c29827..2d93724 100644
--- a/media/engine/payload_type_mapper_unittest.cc
+++ b/media/engine/payload_type_mapper_unittest.cc
@@ -58,7 +58,8 @@
                       48000,
                       2,
                       {{"minptime", "10"}, {"useinbandfec", "1"}}}));
-  EXPECT_EQ(63, mapper_.FindMappingFor({kRedCodecName, 48000, 2}));
+  EXPECT_EQ(
+      63, mapper_.FindMappingFor({kRedCodecName, 48000, 2, {{"", "111/111"}}}));
   // TODO(solenberg): Remove 16k, 32k, 48k DTMF checks once these payload types
   // are dynamically assigned.
   EXPECT_EQ(110, mapper_.FindMappingFor({kDtmfCodecName, 48000, 1}));