diff --git a/tests/testutil.py b/tests/testutil.py
index c113e1bbd11b25798e3b0b9f718c139c98cab9fc..7fc38156f5e148911f003ddabf181d25ebb74bc2 100644
--- a/tests/testutil.py
+++ b/tests/testutil.py
@@ -33,6 +33,8 @@ def parse_date(s, fmt='%Y-%m-%d'):
 def Posting(account, number,
             currency='USD', cost=None, price=None, flag=None,
             **meta):
+    if not meta:
+        meta = None
     return bc_data.Posting(
         account,
         bc_amount.Amount(Decimal(number), currency),