diff --git a/tests/i18n/tests.py b/tests/i18n/tests.py
index 315af09e62..55cd35f7f3 100644
--- a/tests/i18n/tests.py
+++ b/tests/i18n/tests.py
@@ -316,6 +316,9 @@ class TranslationTests(SimpleTestCase):
             # With > 2 characters after the dash.
             ('sr-latn', 'sr_Latn'),
             ('sr-LATN', 'sr_Latn'),
+            # 3-char language codes.
+            ('ber-MA', 'ber_MA'),
+            ('BER-MA', 'ber_MA'),
             # With private use subtag (x-informal).
             ('nl-nl-x-informal', 'nl_NL-x-informal'),
             ('NL-NL-X-INFORMAL', 'nl_NL-x-informal'),