diff --git a/media/base/media_constants.cc b/media/base/media_constants.cc
index 2f29a2036b..f91ac33c90 100644
--- a/media/base/media_constants.cc
+++ b/media/base/media_constants.cc
@@ -44,7 +44,6 @@ const char kCodecParamAssociatedCodecName[] = "acn";
 const char kCodecParamNotInNameValueFormat[] = "";
 
 const char kOpusCodecName[] = "opus";
-const char kIsacCodecName[] = "ISAC";
 const char kL16CodecName[] = "L16";
 const char kG722CodecName[] = "G722";
 const char kIlbcCodecName[] = "ILBC";
diff --git a/media/base/media_constants.h b/media/base/media_constants.h
index f843d50ce5..ca3213ea0f 100644
--- a/media/base/media_constants.h
+++ b/media/base/media_constants.h
@@ -45,7 +45,6 @@ extern const char kCodecParamAssociatedCodecName[];
 extern const char kCodecParamNotInNameValueFormat[];
 
 extern const char kOpusCodecName[];
-extern const char kIsacCodecName[];
 extern const char kL16CodecName[];
 extern const char kG722CodecName[];
 extern const char kIlbcCodecName[];
diff --git a/media/engine/payload_type_mapper.cc b/media/engine/payload_type_mapper.cc
index c63d1d7221..66c48a776b 100644
--- a/media/engine/payload_type_mapper.cc
+++ b/media/engine/payload_type_mapper.cc
@@ -62,8 +62,6 @@ PayloadTypeMapper::PayloadTypeMapper()
            // Payload type assignments currently used by WebRTC.
            // Includes data to reduce collisions (and thus reassignments)
            {{kIlbcCodecName, 8000, 1}, 102},
-           {{kIsacCodecName, 16000, 1}, 103},
-           {{kIsacCodecName, 32000, 1}, 104},
            {{kCnCodecName, 16000, 1}, 105},
            {{kCnCodecName, 32000, 1}, 106},
            {{kOpusCodecName,
diff --git a/media/engine/payload_type_mapper_unittest.cc b/media/engine/payload_type_mapper_unittest.cc
index 90e113c7b6..92253a0f5d 100644
--- a/media/engine/payload_type_mapper_unittest.cc
+++ b/media/engine/payload_type_mapper_unittest.cc
@@ -50,8 +50,6 @@ TEST_F(PayloadTypeMapperTest, WebRTCPayloadTypes) {
   // Tests that the payload mapper knows about the audio formats we've
   // been using in WebRTC, with their hard coded values.
   EXPECT_EQ(102, mapper_.FindMappingFor({kIlbcCodecName, 8000, 1}));
-  EXPECT_EQ(103, mapper_.FindMappingFor({kIsacCodecName, 16000, 1}));
-  EXPECT_EQ(104, mapper_.FindMappingFor({kIsacCodecName, 32000, 1}));
   EXPECT_EQ(105, mapper_.FindMappingFor({kCnCodecName, 16000, 1}));
   EXPECT_EQ(106, mapper_.FindMappingFor({kCnCodecName, 32000, 1}));
   EXPECT_EQ(111, mapper_.FindMappingFor(
diff --git a/sdk/objc/api/peerconnection/RTCRtpCodecParameters.mm b/sdk/objc/api/peerconnection/RTCRtpCodecParameters.mm
index 753667b635..6201e57b93 100644
--- a/sdk/objc/api/peerconnection/RTCRtpCodecParameters.mm
+++ b/sdk/objc/api/peerconnection/RTCRtpCodecParameters.mm
@@ -21,7 +21,6 @@ const NSString * const kRTCRedCodecName = @(cricket::kRedCodecName);
 const NSString * const kRTCUlpfecCodecName = @(cricket::kUlpfecCodecName);
 const NSString * const kRTCFlexfecCodecName = @(cricket::kFlexfecCodecName);
 const NSString * const kRTCOpusCodecName = @(cricket::kOpusCodecName);
-const NSString * const kRTCIsacCodecName = @(cricket::kIsacCodecName);
 const NSString * const kRTCL16CodecName  = @(cricket::kL16CodecName);
 const NSString * const kRTCG722CodecName = @(cricket::kG722CodecName);
 const NSString * const kRTCIlbcCodecName = @(cricket::kIlbcCodecName);