diff --git a/oxrlib/config.py b/oxrlib/config.py
index e85cb3a..682a550 100644
--- a/oxrlib/config.py
+++ b/oxrlib/config.py
@@ -123,17 +123,17 @@ class Configuration:
             "If you omit the year or month, it fills in the current year/month."
         )
         hist_parser.add_argument(
-            'word1', nargs='?', metavar='first code',
+            'word1', nargs='?', metavar='amount',
+            help="Convert this amount of currency. If not specified, show rates.",
+        )
+        hist_parser.add_argument(
+            'word2', nargs='?', metavar='first code',
             help="Convert or show rates from this currency, in three-letter code format. "
             "If not specified, show all rates on the given date.",
         )
-        hist_parser.add_argument(
-            'word2', nargs='?', metavar='amount',
-            help="Convert this amount of currency. If not specified, show rates.",
-        )
         hist_parser.add_argument(
             'word3', nargs='?', metavar='second code',
-            help="Convert to this currency, in three-letter code format. "
+            help="Convert or show rates to this currency, in three-letter code format. "
             "If not specified, defaults to the base currency.",
         )
         hist_parser.add_argument('word4', nargs='?', help=argparse.SUPPRESS)
@@ -184,21 +184,25 @@ class Configuration:
                                  currency_list, convert_fallback=True)
         self._read_from_conffile('ledger', 'Historical', False, getter='getboolean')
         self.args.to_currency = self.args.base
-        if self.args.word4 and (self.args.word3.lower() in self.PREPOSITIONS):
-            self.args.word3 = self.args.word4
-        if self.args.word1 is None:
+        raw_words = iter(getattr(self.args, 'word' + c) for c in '1234')
+        words = iter(word for word in raw_words if word is not None)
+        try:
+            next_word = next(words)
+            try:
+                self.args.amount = decimal.Decimal(next_word)
+            except decimal.InvalidOperation:
+                pass
+            else:
+                # If an amount was given, a currency code must be given too.
+                # If it wasn't, set a value that can't be parsed as a currency.
+                next_word = next(words, 'none given')
+            self.args.from_currency = self._convert_or_error(currency_code, next_word)
+            next_word = next(words)
+            if next_word.lower() in self.PREPOSITIONS:
+                next_word = next(words, next_word)
+            self.args.to_currency = self._convert_or_error(currency_code, next_word)
+        except StopIteration:
             pass
-        elif self.args.word2 is None:
-            self.args.from_currency = self._convert_or_error(
-                currency_code, self.args.word1)
-        else:
-            self.args.amount = self._convert_or_error(
-                decimal.Decimal, self.args.word1)
-            self.args.from_currency = self._convert_or_error(
-                currency_code, self.args.word2)
-            if self.args.word3 is not None:
-                self.args.to_currency = self._convert_or_error(
-                    currency_code, self.args.word3 or self.args.base)
 
     def _build_cache_loader(self):
         kwargs = dict(self.conffile.items('Cache'))
diff --git a/tests/test_Configuration.py b/tests/test_Configuration.py
index 0f5e94d..4b34e91 100644
--- a/tests/test_Configuration.py
+++ b/tests/test_Configuration.py
@@ -49,6 +49,8 @@ def test_historical_default_base(ini_filename, expected_currency, use_switch, an
 
 @pytest.mark.parametrize('amount,from_curr,preposition,to_curr', [
     (None, 'JPY', None, None),
+    (None, 'gbp', None, 'Aud'),
+    (None, 'CHF', 'to', 'eur'),
     (decimal.Decimal('1000'), 'chf', None, None),
     (decimal.Decimal('999'), 'Eur', None, 'Chf'),
     (decimal.Decimal('12.34'), 'gbp', 'IN', 'eur'),
@@ -70,6 +72,8 @@ def test_historical_argparsing_success(amount, from_curr, preposition, to_curr,
     ['99', 'usd', 'minus', 'jpy'],
     ['usdjpy'],
     ['44', 'eur', 'in', 'chf', 'pronto'],
+    ['eur', 'into'],
+    ['50', 'jpy', 'in'],
 ])
 def test_historical_argparsing_failure(arglist, any_date):
     arglist = ['historical', any_date.isoformat()] + arglist