diff --git a/lib/ui/window.dart b/lib/ui/window.dart
index c0b6bb9fe861c..1c9399b670eaa 100644
--- a/lib/ui/window.dart
+++ b/lib/ui/window.dart
@@ -475,12 +475,14 @@ class Locale {
       return true;
     return other is Locale
         && other.languageCode == languageCode
-        && other.scriptCode == scriptCode
-        && other.countryCode == countryCode;
+        && other.scriptCode == scriptCode // scriptCode cannot be ''
+        && (other.countryCode == countryCode // Treat '' as equal to null.
+            || other.countryCode != null && other.countryCode.isEmpty && countryCode == null
+            || countryCode != null && countryCode.isEmpty && other.countryCode == null);
   }
 
   @override
-  int get hashCode => hashValues(languageCode, scriptCode, countryCode);
+  int get hashCode => hashValues(languageCode, scriptCode, countryCode == '' ? null : countryCode);
 
   static Locale _cachedLocale;
   static String _cachedLocaleString;
diff --git a/testing/dart/locale_test.dart b/testing/dart/locale_test.dart
index 5bebd5106be6d..64c16db78688b 100644
--- a/testing/dart/locale_test.dart
+++ b/testing/dart/locale_test.dart
@@ -13,8 +13,6 @@ void main() {
     expect(const Locale('en').toLanguageTag(), 'en');
     expect(const Locale('en'), const Locale('en', $null));
     expect(const Locale('en').hashCode, const Locale('en', $null).hashCode);
-    expect(const Locale('en'), isNot(const Locale('en', '')));
-    expect(const Locale('en').hashCode, isNot(const Locale('en', '').hashCode));
     expect(const Locale('en', 'US').toLanguageTag(), 'en-US');
     expect(const Locale('en', 'US').toString(), 'en_US');
     expect(const Locale('iw').toLanguageTag(), 'he');
@@ -52,6 +50,16 @@ void main() {
            isNot(const Locale.fromSubtags(languageCode: 'en', scriptCode: 'Latn')));
     expect(const Locale.fromSubtags(languageCode: 'en').hashCode,
            isNot(const Locale.fromSubtags(languageCode: 'en', scriptCode: 'Latn').hashCode));
+
+    expect(const Locale('en', ''), const Locale('en'));
+    expect(const Locale('en'), const Locale('en', ''));
+    expect(const Locale('en'), const Locale('en'));
+    expect(const Locale('en', ''), const Locale('en', ''));
+
+    expect(const Locale('en', ''), isNot(const Locale('en', 'GB')));
+    expect(const Locale('en'), isNot(const Locale('en', 'GB')));
+    expect(const Locale('en', 'GB'), isNot(const Locale('en', '')));
+    expect(const Locale('en', 'GB'), isNot(const Locale('en')));
   });
 
   test('Locale toString does not include separator for \'\'', () {