diff --git a/conservancy_beancount/reports/core.py b/conservancy_beancount/reports/core.py
index a53c4b9836e1ed3cd88b70cd497ed2f60fdd9c91..7c4f666cb9bdccf092e797a59dbf8e69d3965a7a 100644
--- a/conservancy_beancount/reports/core.py
+++ b/conservancy_beancount/reports/core.py
@@ -231,8 +231,9 @@ class Balance(Mapping[str, data.Amount]):
             amounts = list(balance.values())
             amounts.sort(key=lambda amt: (-abs(amt.number), amt.currency))
             return sep.join(
-                babel.numbers.format_currency(amt.number, amt.currency, fmt)
-                for amt in amounts
+                babel.numbers.format_currency(
+                    amt.number, amt.currency, fmt, format_type='accounting',
+                ) for amt in amounts
             )
 
 
diff --git a/tests/test_reports_balance.py b/tests/test_reports_balance.py
index 4eafad259855b52aad61d776df1007abf308df1a..8f7e1b97cef0149243e80cf74f5d9ddd2d0e9742 100644
--- a/tests/test_reports_balance.py
+++ b/tests/test_reports_balance.py
@@ -419,10 +419,11 @@ def test_format_sep(sep):
     balance = core.Balance(amounts_from_map(mapping))
     assert balance.format(sep=sep) == expected
 
-def test_format_none():
-    args = (65000, 'BRL')
+@pytest.mark.parametrize('number', [65000, -77000])
+def test_format_none(number):
+    args = (number, 'BRL')
     balance = core.Balance([testutil.Amount(*args)])
-    expected = babel.numbers.format_currency(*args)
+    expected = babel.numbers.format_currency(*args, format_type='accounting')
     assert balance.format(None) == expected
 
 @pytest.mark.parametrize('empty', [