diff --git a/LICENSE_THIRD_PARTY b/LICENSE_THIRD_PARTY
index ee92c5ca18..adfb732607 100644
--- a/LICENSE_THIRD_PARTY
+++ b/LICENSE_THIRD_PARTY
@@ -2,7 +2,6 @@ This source tree contains third party source code which is governed by third
 party licenses. Paths to the files and associated licenses are collected here.
 
 Files governed by third party licenses:
-common_audio/fft4g.c
 common_audio/signal_processing/spl_sqrt_floor.c
 common_audio/signal_processing/spl_sqrt_floor_arm.S
 
@@ -41,15 +40,3 @@ License:
  * Kevin
  */
 -------------------------------------------------------------------------------
-Files:
-common_audio/fft4g.c
-
-License:
-/*
- * http://www.kurims.kyoto-u.ac.jp/~ooura/fft.html
- * Copyright Takuya OOURA, 1996-2001
- *
- * You may use, copy, modify and distribute this code for any purpose (include
- * commercial use) and without fee. Please refer to this package when you modify
- * this code.
- */
diff --git a/common_audio/BUILD.gn b/common_audio/BUILD.gn
index 7b5de0c17a..6290360b51 100644
--- a/common_audio/BUILD.gn
+++ b/common_audio/BUILD.gn
@@ -52,7 +52,6 @@ rtc_static_library("common_audio") {
 
   deps = [
     ":common_audio_c",
-    ":fft4g",
     ":sinc_resampler",
     "..:webrtc_common",
     "../rtc_base:checks",
@@ -63,6 +62,7 @@ rtc_static_library("common_audio") {
     "../rtc_base/system:arch",
     "../system_wrappers",
     "../system_wrappers:cpu_features_api",
+    "third_party/fft4g:fft4g",
     "//third_party/abseil-cpp/absl/types:optional",
   ]
 
@@ -190,7 +190,6 @@ rtc_source_set("common_audio_c") {
   deps = [
     ":common_audio_c_arm_asm",
     ":common_audio_cc",
-    ":fft4g",
     "..:webrtc_common",
     "../rtc_base:checks",
     "../rtc_base:compile_assert_c",
@@ -199,14 +198,7 @@ rtc_source_set("common_audio_c") {
     "../rtc_base/system:arch",
     "../system_wrappers",
     "../system_wrappers:cpu_features_api",
-  ]
-}
-
-rtc_source_set("fft4g") {
-  visibility += webrtc_default_visibility
-  sources = [
-    "fft4g.c",
-    "fft4g.h",
+    "third_party/fft4g:fft4g",
   ]
 }
 
diff --git a/common_audio/real_fourier_ooura.cc b/common_audio/real_fourier_ooura.cc
index db65d269fc..89694c1667 100644
--- a/common_audio/real_fourier_ooura.cc
+++ b/common_audio/real_fourier_ooura.cc
@@ -13,7 +13,7 @@
 #include <algorithm>
 #include <cmath>
 
-#include "common_audio/fft4g.h"
+#include "common_audio/third_party/fft4g/fft4g.h"
 #include "rtc_base/checks.h"
 
 namespace webrtc {
diff --git a/common_audio/third_party/fft4g/BUILD.gn b/common_audio/third_party/fft4g/BUILD.gn
new file mode 100644
index 0000000000..4743c84dac
--- /dev/null
+++ b/common_audio/third_party/fft4g/BUILD.gn
@@ -0,0 +1,16 @@
+# 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.
+
+import("../../../webrtc.gni")
+
+rtc_source_set("fft4g") {
+  sources = [
+    "fft4g.c",
+    "fft4g.h",
+  ]
+}
diff --git a/common_audio/third_party/fft4g/LICENSE b/common_audio/third_party/fft4g/LICENSE
new file mode 100644
index 0000000000..3bf870aa3c
--- /dev/null
+++ b/common_audio/third_party/fft4g/LICENSE
@@ -0,0 +1,8 @@
+/*
+ * http://www.kurims.kyoto-u.ac.jp/~ooura/fft.html
+ * Copyright Takuya OOURA, 1996-2001
+ *
+ * You may use, copy, modify and distribute this code for any purpose (include
+ * commercial use) and without fee. Please refer to this package when you modify
+ * this code.
+ */
diff --git a/common_audio/third_party/fft4g/README.chromium b/common_audio/third_party/fft4g/README.chromium
new file mode 100644
index 0000000000..9df2ddb5e2
--- /dev/null
+++ b/common_audio/third_party/fft4g/README.chromium
@@ -0,0 +1,13 @@
+Name: General Purpose FFT (Fast Fourier/Cosine/Sine Transform) Package
+Short Name: fft4g
+URL: http://www.kurims.kyoto-u.ac.jp/~ooura/fft.html
+Version: 0
+Date: 2018-06-19
+License: Custome license
+License File: LICENSE
+Security Critical: yes
+
+Description:
+This is a package to calculate Discrete Fourier/Cosine/Sine Transforms of
+1-dimensional sequences of length 2^N. This package contains C and Fortran
+FFT codes.
diff --git a/common_audio/fft4g.c b/common_audio/third_party/fft4g/fft4g.c
similarity index 100%
rename from common_audio/fft4g.c
rename to common_audio/third_party/fft4g/fft4g.c
diff --git a/common_audio/fft4g.h b/common_audio/third_party/fft4g/fft4g.h
similarity index 100%
rename from common_audio/fft4g.h
rename to common_audio/third_party/fft4g/fft4g.h
diff --git a/modules/audio_processing/BUILD.gn b/modules/audio_processing/BUILD.gn
index 3c257a091f..6af2bc0a37 100644
--- a/modules/audio_processing/BUILD.gn
+++ b/modules/audio_processing/BUILD.gn
@@ -108,7 +108,7 @@ rtc_static_library("audio_processing") {
     "../../api/audio:echo_control",
     "../../audio/utility:audio_frame_operations",
     "../../common_audio:common_audio_c",
-    "../../common_audio:fft4g",
+    "../../common_audio/third_party/fft4g:fft4g",
     "../../rtc_base:checks",
     "../../rtc_base:deprecation",
     "../../rtc_base:gtest_prod",
@@ -260,7 +260,7 @@ rtc_source_set("audio_processing_c") {
     "../..:webrtc_common",
     "../../common_audio",
     "../../common_audio:common_audio_c",
-    "../../common_audio:fft4g",
+    "../../common_audio/third_party/fft4g:fft4g",
     "../../rtc_base:checks",
     "../../rtc_base:rtc_base_approved",
     "../../system_wrappers:cpu_features_api",
diff --git a/modules/audio_processing/agc/BUILD.gn b/modules/audio_processing/agc/BUILD.gn
index 1ce3eae201..18dbfb9e92 100644
--- a/modules/audio_processing/agc/BUILD.gn
+++ b/modules/audio_processing/agc/BUILD.gn
@@ -67,7 +67,7 @@ rtc_source_set("agc_legacy_c") {
     "../../..:webrtc_common",
     "../../../common_audio",
     "../../../common_audio:common_audio_c",
-    "../../../common_audio:fft4g",
+    "../../../common_audio/third_party/fft4g",
     "../../../rtc_base:checks",
     "../../../rtc_base:rtc_base_approved",
     "../../../system_wrappers:cpu_features_api",
diff --git a/modules/audio_processing/ns/ns_core.c b/modules/audio_processing/ns/ns_core.c
index c87713acaf..bc5dd6d451 100644
--- a/modules/audio_processing/ns/ns_core.c
+++ b/modules/audio_processing/ns/ns_core.c
@@ -13,8 +13,8 @@
 #include <stdlib.h>
 
 #include "rtc_base/checks.h"
-#include "common_audio/fft4g.h"
 #include "common_audio/signal_processing/include/signal_processing_library.h"
+#include "common_audio/third_party/fft4g/fft4g.h"
 #include "modules/audio_processing/ns/noise_suppression.h"
 #include "modules/audio_processing/ns/ns_core.h"
 #include "modules/audio_processing/ns/windows_private.h"
diff --git a/modules/audio_processing/transient/transient_suppressor.cc b/modules/audio_processing/transient/transient_suppressor.cc
index b62935a705..1a5ed5669f 100644
--- a/modules/audio_processing/transient/transient_suppressor.cc
+++ b/modules/audio_processing/transient/transient_suppressor.cc
@@ -17,9 +17,9 @@
 #include <deque>
 #include <set>
 
-#include "common_audio/fft4g.h"
 #include "common_audio/include/audio_util.h"
 #include "common_audio/signal_processing/include/signal_processing_library.h"
+#include "common_audio/third_party/fft4g/fft4g.h"
 #include "modules/audio_processing/ns/windows_private.h"
 #include "modules/audio_processing/transient/common.h"
 #include "modules/audio_processing/transient/transient_detector.h"
diff --git a/modules/audio_processing/vad/BUILD.gn b/modules/audio_processing/vad/BUILD.gn
index 378fbb8920..6c64e947e5 100644
--- a/modules/audio_processing/vad/BUILD.gn
+++ b/modules/audio_processing/vad/BUILD.gn
@@ -38,7 +38,7 @@ rtc_static_library("vad") {
     "../../../audio/utility:audio_frame_operations",
     "../../../common_audio",
     "../../../common_audio:common_audio_c",
-    "../../../common_audio:fft4g",
+    "../../../common_audio/third_party/fft4g:fft4g",
     "../../../rtc_base:checks",
     "../../audio_coding:isac_vad",
   ]
diff --git a/modules/audio_processing/vad/vad_audio_proc.cc b/modules/audio_processing/vad/vad_audio_proc.cc
index e9007c61b2..53eb6de70f 100644
--- a/modules/audio_processing/vad/vad_audio_proc.cc
+++ b/modules/audio_processing/vad/vad_audio_proc.cc
@@ -14,7 +14,7 @@
 #include <stdio.h>
 #include <string.h>
 
-#include "common_audio/fft4g.h"
+#include "common_audio/third_party/fft4g/fft4g.h"
 #include "modules/audio_processing/vad/pitch_internal.h"
 #include "modules/audio_processing/vad/pole_zero_filter.h"
 #include "modules/audio_processing/vad/vad_audio_proc_internal.h"
diff --git a/tools_webrtc/libs/generate_licenses.py b/tools_webrtc/libs/generate_licenses.py
index a4f9cbf1eb..5befb88a32 100755
--- a/tools_webrtc/libs/generate_licenses.py
+++ b/tools_webrtc/libs/generate_licenses.py
@@ -53,6 +53,7 @@ LIB_TO_LICENSES_DICT = {
     'fft': ['modules/third_party/fft/LICENSE'],
     'g711': ['modules/third_party/g711/LICENSE'],
     'g722': ['modules/third_party/g722/LICENSE'],
+    'fft4g': ['common_audio/third_party/fft4g/LICENSE'],
 
     # Compile time dependencies, no license needed:
     'yasm': [],