diff --git a/test/fuzzers/BUILD.gn b/test/fuzzers/BUILD.gn
index e36fbb6c07..4caac345cc 100644
--- a/test/fuzzers/BUILD.gn
+++ b/test/fuzzers/BUILD.gn
@@ -316,6 +316,24 @@ webrtc_fuzzer_test("audio_encoder_opus_fuzzer") {
   ]
 }
 
+webrtc_fuzzer_test("audio_encoder_isac_fixed_fuzzer") {
+  sources = [ "audio_encoder_isax_fixed_fuzzer.cc" ]
+  deps = [
+    ":audio_encoder_fuzzer",
+    "../../api/audio_codecs/isac:audio_encoder_isac_fix",
+    "../../rtc_base:checks",
+  ]
+}
+
+webrtc_fuzzer_test("audio_encoder_isac_float_fuzzer") {
+  sources = [ "audio_encoder_isax_float_fuzzer.cc" ]
+  deps = [
+    ":audio_encoder_fuzzer",
+    "../../api/audio_codecs/isac:audio_encoder_isac_float",
+    "../../rtc_base:checks",
+  ]
+}
+
 webrtc_fuzzer_test("turn_unwrap_fuzzer") {
   sources = [ "turn_unwrap_fuzzer.cc" ]
   deps = [
diff --git a/test/fuzzers/audio_encoder_isax_fixed_fuzzer.cc b/test/fuzzers/audio_encoder_isax_fixed_fuzzer.cc
new file mode 100644
index 0000000000..5357dc1b3e
--- /dev/null
+++ b/test/fuzzers/audio_encoder_isax_fixed_fuzzer.cc
@@ -0,0 +1,26 @@
+/*
+ *  Copyright (c) 2018 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "api/audio_codecs/isac/audio_encoder_isac_fix.h"
+#include "rtc_base/checks.h"
+#include "test/fuzzers/audio_encoder_fuzzer.h"
+
+namespace webrtc {
+
+void FuzzOneInput(const uint8_t* data, size_t size) {
+  AudioEncoderIsacFix::Config config;
+  RTC_CHECK(config.IsOk());
+  constexpr int kPayloadType = 100;
+  FuzzAudioEncoder(
+      /*data_view=*/{data, size},
+      /*encoder=*/AudioEncoderIsacFix::MakeAudioEncoder(config, kPayloadType));
+}
+
+}  // namespace webrtc
diff --git a/test/fuzzers/audio_encoder_isax_float_fuzzer.cc b/test/fuzzers/audio_encoder_isax_float_fuzzer.cc
new file mode 100644
index 0000000000..f9e2e0206d
--- /dev/null
+++ b/test/fuzzers/audio_encoder_isax_float_fuzzer.cc
@@ -0,0 +1,27 @@
+/*
+ *  Copyright (c) 2018 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "api/audio_codecs/isac/audio_encoder_isac_float.h"
+#include "rtc_base/checks.h"
+#include "test/fuzzers/audio_encoder_fuzzer.h"
+
+namespace webrtc {
+
+void FuzzOneInput(const uint8_t* data, size_t size) {
+  AudioEncoderIsacFloat::Config config;
+  config.sample_rate_hz = 16000;
+  RTC_CHECK(config.IsOk());
+  constexpr int kPayloadType = 100;
+  FuzzAudioEncoder(/*data_view=*/{data, size},
+                   /*encoder=*/AudioEncoderIsacFloat::MakeAudioEncoder(
+                       config, kPayloadType));
+}
+
+}  // namespace webrtc