diff --git a/webrtc/base/BUILD.gn b/webrtc/base/BUILD.gn
index 0a62567d96..cbf84fe6e4 100644
--- a/webrtc/base/BUILD.gn
+++ b/webrtc/base/BUILD.gn
@@ -214,7 +214,6 @@ static_library("rtc_base") {
     "autodetectproxy.h",
     "base64.cc",
     "base64.h",
-    "basicdefs.h",
     "common.cc",
     "common.h",
     "crc32.cc",
diff --git a/webrtc/base/base.gyp b/webrtc/base/base.gyp
index 37421f7bae..6855df8c7e 100644
--- a/webrtc/base/base.gyp
+++ b/webrtc/base/base.gyp
@@ -181,7 +181,6 @@
         'bandwidthsmoother.h',
         'base64.cc',
         'base64.h',
-        'basicdefs.h',
         'bind.h',
         'callback.h',
         'common.cc',
diff --git a/webrtc/base/basicdefs.h b/webrtc/base/basicdefs.h
deleted file mode 100644
index 1dee2ae658..0000000000
--- a/webrtc/base/basicdefs.h
+++ /dev/null
@@ -1,20 +0,0 @@
-/*
- *  Copyright 2004 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.
- */
-
-#ifndef WEBRTC_BASE_BASICDEFS_H_
-#define WEBRTC_BASE_BASICDEFS_H_
-
-#if HAVE_CONFIG_H
-#include "config.h"  // NOLINT
-#endif
-
-#define ARRAY_SIZE(x) (static_cast<int>(sizeof(x) / sizeof(x[0])))
-
-#endif  // WEBRTC_BASE_BASICDEFS_H_