diff --git a/accountant/api/views/parsers.py b/accountant/api/views/parsers.py
index 08919ca..9209343 100644
--- a/accountant/api/views/parsers.py
+++ b/accountant/api/views/parsers.py
@@ -14,6 +14,7 @@
     You should have received a copy of the GNU Affero General Public License
     along with Accountant.  If not, see <http://www.gnu.org/licenses/>.
 """
+from copy import deepcopy
 import dateutil.parser
 
 from flask.ext.restful import reqparse
@@ -29,9 +30,15 @@ range_parser.add_argument(
     type=lambda a: dateutil.parser.parse(a) if a else None
 )
 
+# Parser for an account id.
+account_id_parser = reqparse.RequestParser()
+account_id_parser.add_argument('account_id', type=int)
+
 # Parser for a date range and an account id.
 account_range_parser = range_parser.copy()
-account_range_parser.add_argument('account_id', type=int)
+account_range_parser.add_argument(
+    deepcopy(account_id_parser.args[0])
+)
 
 # Parser for an account.
 account_parser = reqparse.RequestParser()
@@ -53,10 +60,6 @@ operation_parser.add_argument('scheduled_operation_id', type=int)
 operation_parser.add_argument('confirmed', type=bool)
 operation_parser.add_argument('canceled', type=bool)
 
-# Parser for an account id.
-account_id_parser = reqparse.RequestParser()
-account_id_parser.add_argument('account_id', type=int)
-
 # Parser for a scheduled operation.
 scheduled_operation_parser = reqparse.RequestParser()
 scheduled_operation_parser.add_argument(