diff --git a/filenames.gni b/filenames.gni
index 404b2f3502e29..324e6caed6aef 100644
--- a/filenames.gni
+++ b/filenames.gni
@@ -110,6 +110,8 @@ filenames = {
     "shell/browser/api/electron_api_web_contents.h",
     "shell/browser/api/electron_api_web_contents_impl.cc",
     "shell/browser/api/electron_api_web_contents_mac.mm",
+    "shell/browser/api/electron_api_web_contents_linux.cc",
+    "shell/browser/api/electron_api_web_contents_win.cc",
     "shell/browser/api/electron_api_web_contents_view.cc",
     "shell/browser/api/electron_api_web_contents_view.h",
     "shell/browser/api/electron_api_web_request.cc",
diff --git a/shell/browser/api/electron_api_web_contents.cc b/shell/browser/api/electron_api_web_contents.cc
index b65096d368ad3..e61a7aa5a596b 100644
--- a/shell/browser/api/electron_api_web_contents.cc
+++ b/shell/browser/api/electron_api_web_contents.cc
@@ -100,6 +100,7 @@
 #include "third_party/blink/public/mojom/frame/find_in_page.mojom.h"
 #include "third_party/blink/public/mojom/frame/fullscreen.mojom.h"
 #include "third_party/blink/public/mojom/messaging/transferable_message.mojom.h"
+#include "third_party/blink/public/mojom/renderer_preferences.mojom.h"
 #include "ui/base/cursor/cursor.h"
 #include "ui/base/mojom/cursor_type.mojom-shared.h"
 #include "ui/display/screen.h"
@@ -121,7 +122,6 @@
 #endif
 
 #if defined(OS_LINUX) || defined(OS_WIN)
-#include "third_party/blink/public/mojom/renderer_preferences.mojom.h"
 #include "ui/gfx/font_render_params.h"
 #endif
 
@@ -535,7 +535,7 @@ void WebContents::InitWithSessionAndOptions(
   managed_web_contents()->GetView()->SetDelegate(this);
 
   auto* prefs = web_contents()->GetMutableRendererPrefs();
-  prefs->accept_languages = g_browser_process->GetApplicationLocale();
+  SetAcceptLanguages(prefs);
 
 #if defined(OS_LINUX) || defined(OS_WIN)
   // Update font settings.
diff --git a/shell/browser/api/electron_api_web_contents.h b/shell/browser/api/electron_api_web_contents.h
index 980ff85b0630f..2db27c7ffe1dd 100644
--- a/shell/browser/api/electron_api_web_contents.h
+++ b/shell/browser/api/electron_api_web_contents.h
@@ -579,6 +579,8 @@ class WebContents : public gin_helper::TrackableObject<WebContents>,
   void InitZoomController(content::WebContents* web_contents,
                           const gin_helper::Dictionary& options);
 
+  void SetAcceptLanguages(blink::mojom::RendererPreferences* prefs);
+
   v8::Global<v8::Value> session_;
   v8::Global<v8::Value> devtools_web_contents_;
   v8::Global<v8::Value> debugger_;
diff --git a/shell/browser/api/electron_api_web_contents_linux.cc b/shell/browser/api/electron_api_web_contents_linux.cc
new file mode 100644
index 0000000000000..27ac73c9b4cd3
--- /dev/null
+++ b/shell/browser/api/electron_api_web_contents_linux.cc
@@ -0,0 +1,20 @@
+// Copyright (c) 2020 GitHub, Inc.
+// Use of this source code is governed by the MIT license that can be
+// found in the LICENSE file.
+
+#include "shell/browser/api/electron_api_web_contents.h"
+
+#include "chrome/browser/browser_process.h"
+#include "content/public/common/renderer_preferences.h"
+
+namespace electron {
+
+namespace api {
+
+void WebContents::SetAcceptLanguages(blink::mojom::RendererPreferences* prefs) {
+  prefs->accept_languages = g_browser_process->GetApplicationLocale();
+}
+
+}  // namespace api
+
+}  // namespace electron
diff --git a/shell/browser/api/electron_api_web_contents_mac.mm b/shell/browser/api/electron_api_web_contents_mac.mm
index ea70eed08d522..3e0c920400004 100644
--- a/shell/browser/api/electron_api_web_contents_mac.mm
+++ b/shell/browser/api/electron_api_web_contents_mac.mm
@@ -4,6 +4,7 @@
 
 #include "content/public/browser/render_widget_host_view.h"
 #include "shell/browser/api/electron_api_web_contents.h"
+#include "third_party/blink/public/mojom/renderer_preferences.mojom.h"
 
 #import <Cocoa/Cocoa.h>
 
@@ -27,6 +28,11 @@
   return view->HasFocus();
 }
 
+void WebContents::SetAcceptLanguages(blink::mojom::RendererPreferences* prefs) {
+  prefs->accept_languages = base::SysNSStringToUTF8(
+      [[NSLocale preferredLanguages] componentsJoinedByString:@","]);
+}
+
 }  // namespace api
 
 }  // namespace electron
diff --git a/shell/browser/api/electron_api_web_contents_win.cc b/shell/browser/api/electron_api_web_contents_win.cc
new file mode 100644
index 0000000000000..a4e21eca8f86c
--- /dev/null
+++ b/shell/browser/api/electron_api_web_contents_win.cc
@@ -0,0 +1,28 @@
+// Copyright (c) 2020 GitHub, Inc.
+// Use of this source code is governed by the MIT license that can be
+// found in the LICENSE file.
+
+#include "shell/browser/api/electron_api_web_contents.h"
+
+#include "base/strings/sys_string_conversions.h"
+#include "base/win/i18n.h"
+#include "third_party/blink/public/mojom/renderer_preferences.mojom.h"
+
+namespace electron {
+
+namespace api {
+
+void WebContents::SetAcceptLanguages(blink::mojom::RendererPreferences* prefs) {
+  std::vector<base::string16> languages;
+  base::win::i18n::GetThreadPreferredUILanguageList(&languages);
+  std::string accept_langs;
+  for (const auto& s16 : languages) {
+    accept_langs += base::SysWideToUTF8(s16) + ',';
+  }
+  accept_langs.pop_back();
+  prefs->accept_languages = accept_langs;
+}
+
+}  // namespace api
+
+}  // namespace electron
diff --git a/spec-main/chromium-spec.ts b/spec-main/chromium-spec.ts
index 2a4320d393427..81760b01b1451 100644
--- a/spec-main/chromium-spec.ts
+++ b/spec-main/chromium-spec.ts
@@ -319,7 +319,8 @@ describe('chromium features', () => {
       const w = new BrowserWindow({ show: false });
       await w.loadURL('about:blank');
       const languages = await w.webContents.executeJavaScript('navigator.languages');
-      expect(languages).to.deep.equal([appLocale]);
+      expect(languages.length).to.be.greaterThan(0);
+      expect(languages[0].split('-')[0]).to.equal(appLocale);
     });
   });