diff --git a/storage_s3/indico_storage_s3/storage.py b/storage_s3/indico_storage_s3/storage.py
index 181d771..bc7ad5e 100644
--- a/storage_s3/indico_storage_s3/storage.py
+++ b/storage_s3/indico_storage_s3/storage.py
@@ -223,7 +223,7 @@ class DynamicS3Storage(S3StorageBase):
     def _get_bucket_name(self, date):
         name = self._replace_bucket_placeholders(self.bucket_name_template, date)
         token = hmac.new(self.bucket_secret.encode('utf-8'), name, hashlib.md5).hexdigest()
-        return '{}-{}'.format(name, token)
+        return '{}-{}'.format(name, token)[:63]
 
     def _replace_bucket_placeholders(self, name, date):
         name = name.replace('<year>', date.strftime('%Y'))
diff --git a/storage_s3/tests/plugin_test.py b/storage_s3/tests/plugin_test.py
index 9928db5..994e147 100644
--- a/storage_s3/tests/plugin_test.py
+++ b/storage_s3/tests/plugin_test.py
@@ -102,8 +102,10 @@ def test_static_bucket_name_too_long():
 
 
 def test_dynamic_bucket_name_too_long():
-    DynamicS3Storage('bucket_secret=secret,bucket_template=test-<year>' + 'x'*37)
-    DynamicS3Storage('bucket_secret=secret,bucket_template=test-<year>-<month>' + 'x'*34)
+    s = DynamicS3Storage('bucket_secret=secret,bucket_template=test-<year>' + 'x'*37)
+    assert len(s._get_current_bucket_name()) == 63
+    s = DynamicS3Storage('bucket_secret=secret,bucket_template=test-<year>-<month>' + 'x'*34)
+    assert len(s._get_current_bucket_name()) == 63
     with pytest.raises(StorageError):
         DynamicS3Storage('bucket_secret=secret,bucket_template=test-<year>' + 'x' * 38)
     with pytest.raises(StorageError):