diff --git a/tests/testutil.py b/tests/testutil.py
index cb6fc1b384936b5a21b0f8cf93a12b1121935e15..583de75a1a9cd2ed47bc37cad028c499c2984e76 100644
--- a/tests/testutil.py
+++ b/tests/testutil.py
@@ -72,11 +72,13 @@ def Amount(number, currency='USD'):
 def Posting(account, number,
             currency='USD', cost=None, price=None, flag=None,
             **meta):
-    if not meta:
+    if not (number is None or isinstance(number, Decimal)):
+        number = Decimal(number)
+    if meta is None:
         meta = None
     return bc_data.Posting(
         account,
-        bc_amount.Amount(Decimal(number), currency),
+        bc_amount.Amount(number, currency),
         cost,
         price,
         flag,