diff --git a/engine/src/flutter/ci/licenses_golden/licenses_flutter b/engine/src/flutter/ci/licenses_golden/licenses_flutter
index 155a0f8612..2802bed8a4 100644
--- a/engine/src/flutter/ci/licenses_golden/licenses_flutter
+++ b/engine/src/flutter/ci/licenses_golden/licenses_flutter
@@ -120,7 +120,6 @@ FILE: ../../../flutter/flow/texture.h
 FILE: ../../../flutter/flow/view_holder.cc
 FILE: ../../../flutter/flow/view_holder.h
 FILE: ../../../flutter/flutter_kernel_transformers/lib/track_widget_constructor_locations.dart
-FILE: ../../../flutter/fml/arraysize.h
 FILE: ../../../flutter/fml/base32.cc
 FILE: ../../../flutter/fml/base32.h
 FILE: ../../../flutter/fml/base32_unittest.cc
@@ -215,6 +214,7 @@ FILE: ../../../flutter/fml/platform/win/message_loop_win.h
 FILE: ../../../flutter/fml/platform/win/native_library_win.cc
 FILE: ../../../flutter/fml/platform/win/paths_win.cc
 FILE: ../../../flutter/fml/platform/win/wstring_conversion.h
+FILE: ../../../flutter/fml/size.h
 FILE: ../../../flutter/fml/string_view.cc
 FILE: ../../../flutter/fml/string_view.h
 FILE: ../../../flutter/fml/string_view_unittest.cc
diff --git a/engine/src/flutter/fml/BUILD.gn b/engine/src/flutter/fml/BUILD.gn
index 759a152408..26f51d99c9 100644
--- a/engine/src/flutter/fml/BUILD.gn
+++ b/engine/src/flutter/fml/BUILD.gn
@@ -6,7 +6,6 @@ import("//build/fuchsia/sdk.gni")
 
 source_set("fml") {
   sources = [
-    "arraysize.h",
     "base32.cc",
     "base32.h",
     "build_config.h",
@@ -47,6 +46,7 @@ source_set("fml") {
     "native_library.h",
     "paths.cc",
     "paths.h",
+    "size.h",
     "string_view.cc",
     "string_view.h",
     "synchronization/atomic_object.h",
diff --git a/engine/src/flutter/fml/arraysize.h b/engine/src/flutter/fml/arraysize.h
deleted file mode 100644
index 636939812b..0000000000
--- a/engine/src/flutter/fml/arraysize.h
+++ /dev/null
@@ -1,16 +0,0 @@
-// Copyright 2013 The Flutter Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef FLUTTER_FML_ARRAYSIZE_H_
-#define FLUTTER_FML_ARRAYSIZE_H_
-
-#include <stddef.h>
-
-#ifndef arraysize
-template <typename T, size_t N>
-char (&ArraySizeHelper(T (&array)[N]))[N];
-#define arraysize(array) (sizeof(ArraySizeHelper(array)))
-#endif
-
-#endif  // FLUTTER_FML_ARRAYSIZE_H_
diff --git a/engine/src/flutter/fml/command_line_unittest.cc b/engine/src/flutter/fml/command_line_unittest.cc
index c04619e483..31907a0fb4 100644
--- a/engine/src/flutter/fml/command_line_unittest.cc
+++ b/engine/src/flutter/fml/command_line_unittest.cc
@@ -6,8 +6,8 @@
 
 #include <utility>
 
-#include "flutter/fml/arraysize.h"
 #include "flutter/fml/macros.h"
+#include "flutter/fml/size.h"
 #include "gtest/gtest.h"
 
 namespace fml {
@@ -197,7 +197,7 @@ TEST(CommandLineTest, CommmandLineFromIterators) {
   {
     static const char* const argv[] = {"my_program", "--flag=value", "arg"};
 
-    auto cl = CommandLineFromIterators(argv, argv + arraysize(argv));
+    auto cl = CommandLineFromIterators(argv, argv + fml::size(argv));
     EXPECT_TRUE(cl.has_argv0());
     EXPECT_EQ(argv[0], cl.argv0());
     std::vector<CommandLine::Option> expected_options = {
@@ -211,7 +211,7 @@ TEST(CommandLineTest, CommmandLineFromIterators) {
 
 TEST(CommandLineTest, CommandLineFromArgcArgv) {
   static const char* const argv[] = {"my_program", "--flag=value", "arg"};
-  const int argc = static_cast<int>(arraysize(argv));
+  const int argc = static_cast<int>(fml::size(argv));
 
   auto cl = CommandLineFromArgcArgv(argc, argv);
   EXPECT_TRUE(cl.has_argv0());
diff --git a/engine/src/flutter/fml/size.h b/engine/src/flutter/fml/size.h
new file mode 100644
index 0000000000..4ffd7f3eec
--- /dev/null
+++ b/engine/src/flutter/fml/size.h
@@ -0,0 +1,19 @@
+// Copyright 2013 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef FLUTTER_FML_SIZE_H_
+#define FLUTTER_FML_SIZE_H_
+
+#include <cstddef>
+
+namespace fml {
+
+template <typename T, std::size_t N>
+constexpr std::size_t size(T (&array)[N]) {
+  return N;
+}
+
+}  // namespace fml
+
+#endif  // FLUTTER_FML_SIZE_H_
diff --git a/engine/src/flutter/fml/synchronization/waitable_event_unittest.cc b/engine/src/flutter/fml/synchronization/waitable_event_unittest.cc
index aa420910d7..97b886b6a9 100644
--- a/engine/src/flutter/fml/synchronization/waitable_event_unittest.cc
+++ b/engine/src/flutter/fml/synchronization/waitable_event_unittest.cc
@@ -16,12 +16,6 @@
 #include "flutter/fml/macros.h"
 #include "gtest/gtest.h"
 
-#ifndef arraysize
-template <typename T, size_t N>
-char (&ArraySizeHelper(T (&array)[N]))[N];
-#define arraysize(array) (sizeof(ArraySizeHelper(array)))
-#endif
-
 namespace fml {
 namespace {
 
diff --git a/engine/src/flutter/runtime/dart_vm.cc b/engine/src/flutter/runtime/dart_vm.cc
index 134065a676..a09a87d106 100644
--- a/engine/src/flutter/runtime/dart_vm.cc
+++ b/engine/src/flutter/runtime/dart_vm.cc
@@ -10,11 +10,11 @@
 #include <vector>
 
 #include "flutter/common/settings.h"
-#include "flutter/fml/arraysize.h"
 #include "flutter/fml/compiler_specific.h"
 #include "flutter/fml/file.h"
 #include "flutter/fml/logging.h"
 #include "flutter/fml/mapping.h"
+#include "flutter/fml/size.h"
 #include "flutter/fml/synchronization/count_down_latch.h"
 #include "flutter/fml/synchronization/thread_annotations.h"
 #include "flutter/fml/time/time_delta.h"
@@ -292,11 +292,11 @@ DartVM::DartVM(std::shared_ptr<const DartVMData> vm_data,
     args.push_back(profiler_flag);
   }
 
-  PushBackAll(&args, kDartLanguageArgs, arraysize(kDartLanguageArgs));
+  PushBackAll(&args, kDartLanguageArgs, fml::size(kDartLanguageArgs));
 
   if (IsRunningPrecompiledCode()) {
     PushBackAll(&args, kDartPrecompilationArgs,
-                arraysize(kDartPrecompilationArgs));
+                fml::size(kDartPrecompilationArgs));
   }
 
   // Enable Dart assertions if we are not running precompiled code. We run non-
@@ -318,42 +318,42 @@ DartVM::DartVM(std::shared_ptr<const DartVMData> vm_data,
   // Debug mode uses the JIT, disable code page write protection to avoid
   // memory page protection changes before and after every compilation.
   PushBackAll(&args, kDartWriteProtectCodeArgs,
-              arraysize(kDartWriteProtectCodeArgs));
+              fml::size(kDartWriteProtectCodeArgs));
 #endif
 
   if (enable_asserts) {
-    PushBackAll(&args, kDartAssertArgs, arraysize(kDartAssertArgs));
+    PushBackAll(&args, kDartAssertArgs, fml::size(kDartAssertArgs));
   }
 
   if (settings_.start_paused) {
-    PushBackAll(&args, kDartStartPausedArgs, arraysize(kDartStartPausedArgs));
+    PushBackAll(&args, kDartStartPausedArgs, fml::size(kDartStartPausedArgs));
   }
 
   if (settings_.disable_service_auth_codes) {
     PushBackAll(&args, kDartDisableServiceAuthCodesArgs,
-                arraysize(kDartDisableServiceAuthCodesArgs));
+                fml::size(kDartDisableServiceAuthCodesArgs));
   }
 
   if (settings_.endless_trace_buffer || settings_.trace_startup) {
     // If we are tracing startup, make sure the trace buffer is endless so we
     // don't lose early traces.
     PushBackAll(&args, kDartEndlessTraceBufferArgs,
-                arraysize(kDartEndlessTraceBufferArgs));
+                fml::size(kDartEndlessTraceBufferArgs));
   }
 
   if (settings_.trace_systrace) {
     PushBackAll(&args, kDartSystraceTraceBufferArgs,
-                arraysize(kDartSystraceTraceBufferArgs));
-    PushBackAll(&args, kDartTraceStreamsArgs, arraysize(kDartTraceStreamsArgs));
+                fml::size(kDartSystraceTraceBufferArgs));
+    PushBackAll(&args, kDartTraceStreamsArgs, fml::size(kDartTraceStreamsArgs));
   }
 
   if (settings_.trace_startup) {
-    PushBackAll(&args, kDartTraceStartupArgs, arraysize(kDartTraceStartupArgs));
+    PushBackAll(&args, kDartTraceStartupArgs, fml::size(kDartTraceStartupArgs));
   }
 
 #if defined(OS_FUCHSIA)
-  PushBackAll(&args, kDartFuchsiaTraceArgs, arraysize(kDartFuchsiaTraceArgs));
-  PushBackAll(&args, kDartTraceStreamsArgs, arraysize(kDartTraceStreamsArgs));
+  PushBackAll(&args, kDartFuchsiaTraceArgs, fml::size(kDartFuchsiaTraceArgs));
+  PushBackAll(&args, kDartTraceStreamsArgs, fml::size(kDartTraceStreamsArgs));
 #endif
 
   for (size_t i = 0; i < settings_.dart_flags.size(); i++)
diff --git a/engine/src/flutter/shell/gpu/gpu_surface_gl.cc b/engine/src/flutter/shell/gpu/gpu_surface_gl.cc
index f92c34cad7..d344e7225a 100644
--- a/engine/src/flutter/shell/gpu/gpu_surface_gl.cc
+++ b/engine/src/flutter/shell/gpu/gpu_surface_gl.cc
@@ -4,8 +4,8 @@
 
 #include "gpu_surface_gl.h"
 
-#include "flutter/fml/arraysize.h"
 #include "flutter/fml/logging.h"
+#include "flutter/fml/size.h"
 #include "flutter/fml/trace_event.h"
 #include "flutter/shell/common/persistent_cache.h"
 #include "third_party/skia/include/core/SkColorFilter.h"
diff --git a/engine/src/flutter/shell/platform/android/flutter_main.cc b/engine/src/flutter/shell/platform/android/flutter_main.cc
index 16b1fbcff7..bae67459e0 100644
--- a/engine/src/flutter/shell/platform/android/flutter_main.cc
+++ b/engine/src/flutter/shell/platform/android/flutter_main.cc
@@ -8,7 +8,6 @@
 
 #include <vector>
 
-#include "flutter/fml/arraysize.h"
 #include "flutter/fml/command_line.h"
 #include "flutter/fml/file.h"
 #include "flutter/fml/macros.h"
@@ -16,6 +15,7 @@
 #include "flutter/fml/paths.h"
 #include "flutter/fml/platform/android/jni_util.h"
 #include "flutter/fml/platform/android/paths_android.h"
+#include "flutter/fml/size.h"
 #include "flutter/lib/ui/plugins/callback_cache.h"
 #include "flutter/runtime/dart_vm.h"
 #include "flutter/runtime/start_up.h"
@@ -145,7 +145,7 @@ bool FlutterMain::Register(JNIEnv* env) {
     return false;
   }
 
-  return env->RegisterNatives(clazz, methods, arraysize(methods)) == 0;
+  return env->RegisterNatives(clazz, methods, fml::size(methods)) == 0;
 }
 
 }  // namespace flutter
diff --git a/engine/src/flutter/shell/platform/android/platform_view_android_jni.cc b/engine/src/flutter/shell/platform/android/platform_view_android_jni.cc
index 38db3453ce..4a40f605f5 100644
--- a/engine/src/flutter/shell/platform/android/platform_view_android_jni.cc
+++ b/engine/src/flutter/shell/platform/android/platform_view_android_jni.cc
@@ -11,11 +11,11 @@
 #include "flutter/assets/directory_asset_bundle.h"
 #include "flutter/assets/zip_asset_store.h"
 #include "flutter/common/settings.h"
-#include "flutter/fml/arraysize.h"
 #include "flutter/fml/file.h"
 #include "flutter/fml/platform/android/jni_util.h"
 #include "flutter/fml/platform/android/jni_weak_ref.h"
 #include "flutter/fml/platform/android/scoped_java_ref.h"
+#include "flutter/fml/size.h"
 #include "flutter/lib/ui/plugins/callback_cache.h"
 #include "flutter/runtime/dart_service_isolate.h"
 #include "flutter/shell/common/run_configuration.h"
@@ -650,7 +650,7 @@ bool RegisterApi(JNIEnv* env) {
   };
 
   if (env->RegisterNatives(g_flutter_jni_class->obj(), flutter_jni_methods,
-                           arraysize(flutter_jni_methods)) != 0) {
+                           fml::size(flutter_jni_methods)) != 0) {
     FML_LOG(ERROR) << "Failed to RegisterNatives with FlutterJNI";
     return false;
   }
@@ -755,7 +755,7 @@ bool PlatformViewAndroid::Register(JNIEnv* env) {
 
   if (env->RegisterNatives(g_flutter_callback_info_class->obj(),
                            callback_info_methods,
-                           arraysize(callback_info_methods)) != 0) {
+                           fml::size(callback_info_methods)) != 0) {
     FML_LOG(ERROR) << "Failed to RegisterNatives with FlutterCallbackInfo";
     return false;
   }
diff --git a/engine/src/flutter/shell/platform/android/vsync_waiter_android.cc b/engine/src/flutter/shell/platform/android/vsync_waiter_android.cc
index 513cc6ff74..7fa284fb65 100644
--- a/engine/src/flutter/shell/platform/android/vsync_waiter_android.cc
+++ b/engine/src/flutter/shell/platform/android/vsync_waiter_android.cc
@@ -8,10 +8,10 @@
 #include <utility>
 
 #include "flutter/common/task_runners.h"
-#include "flutter/fml/arraysize.h"
 #include "flutter/fml/logging.h"
 #include "flutter/fml/platform/android/jni_util.h"
 #include "flutter/fml/platform/android/scoped_java_ref.h"
+#include "flutter/fml/size.h"
 #include "flutter/fml/trace_event.h"
 
 namespace flutter {
@@ -102,7 +102,7 @@ bool VsyncWaiterAndroid::Register(JNIEnv* env) {
 
   FML_CHECK(g_async_wait_for_vsync_method_ != nullptr);
 
-  return env->RegisterNatives(clazz, methods, arraysize(methods)) == 0;
+  return env->RegisterNatives(clazz, methods, fml::size(methods)) == 0;
 }
 
 }  // namespace flutter
diff --git a/engine/src/flutter/shell/platform/fuchsia/dart-pkg/fuchsia/sdk_ext/fuchsia.cc b/engine/src/flutter/shell/platform/fuchsia/dart-pkg/fuchsia/sdk_ext/fuchsia.cc
index 72939661a1..5960a2ddee 100644
--- a/engine/src/flutter/shell/platform/fuchsia/dart-pkg/fuchsia/sdk_ext/fuchsia.cc
+++ b/engine/src/flutter/shell/platform/fuchsia/dart-pkg/fuchsia/sdk_ext/fuchsia.cc
@@ -15,7 +15,7 @@
 #include "dart-pkg/zircon/sdk_ext/handle.h"
 #include "dart-pkg/zircon/sdk_ext/natives.h"
 #include "dart-pkg/zircon/sdk_ext/system.h"
-#include "flutter/fml/arraysize.h"
+#include "flutter/fml/size.h"
 #include "third_party/dart/runtime/include/dart_api.h"
 #include "third_party/tonic/dart_binding_macros.h"
 #include "third_party/tonic/dart_class_library.h"
@@ -64,7 +64,7 @@ Dart_NativeFunction NativeLookup(Dart_Handle name,
   FML_DCHECK(function_name != nullptr);
   FML_DCHECK(auto_setup_scope != nullptr);
   *auto_setup_scope = true;
-  size_t num_entries = arraysize(Entries);
+  size_t num_entries = fml::size(Entries);
   for (size_t i = 0; i < num_entries; ++i) {
     const struct NativeEntries& entry = Entries[i];
     if (!strcmp(function_name, entry.name) &&
@@ -78,7 +78,7 @@ Dart_NativeFunction NativeLookup(Dart_Handle name,
 }
 
 const uint8_t* NativeSymbol(Dart_NativeFunction native_function) {
-  size_t num_entries = arraysize(Entries);
+  size_t num_entries = fml::size(Entries);
   for (size_t i = 0; i < num_entries; ++i) {
     const struct NativeEntries& entry = Entries[i];
     if (entry.function == native_function) {