diff --git a/tests/system/I18n/TimeLegacyTest.php b/tests/system/I18n/TimeLegacyTest.php
index c53b4ce3bda3..8fbd359fbfd5 100644
--- a/tests/system/I18n/TimeLegacyTest.php
+++ b/tests/system/I18n/TimeLegacyTest.php
@@ -1091,11 +1091,11 @@ public function testHumanizeWithArLocale(): void
         $this->resetServices();
 
         $currentLocale = Locale::getDefault();
-        Locale::setDefault('ar');
+        Locale::setDefault('ar-SA');
 
         $config                   = new App();
-        $config->supportedLocales = ['ar'];
-        $config->defaultLocale    = 'ar';
+        $config->supportedLocales = ['ar-SA'];
+        $config->defaultLocale    = 'ar-SA';
         Factories::injectMock('config', 'App', $config);
 
         TimeLegacy::setTestNow('2022-06-14 12:00', 'America/Chicago');
diff --git a/tests/system/I18n/TimeTest.php b/tests/system/I18n/TimeTest.php
index 4dd49d9a5388..af45abcbe4b8 100644
--- a/tests/system/I18n/TimeTest.php
+++ b/tests/system/I18n/TimeTest.php
@@ -1176,11 +1176,11 @@ public function testHumanizeWithArLocale(): void
         $this->resetServices();
 
         $currentLocale = Locale::getDefault();
-        Locale::setDefault('ar');
+        Locale::setDefault('ar-SA');
 
         $config                   = new App();
-        $config->supportedLocales = ['ar'];
-        $config->defaultLocale    = 'ar';
+        $config->supportedLocales = ['ar-SA'];
+        $config->defaultLocale    = 'ar-SA';
         Factories::injectMock('config', 'App', $config);
 
         Time::setTestNow('2022-06-14 12:00', 'America/Chicago');