diff --git a/oxrlib/commands/historical.py b/oxrlib/commands/historical.py
index 828054b7f9b5b7d12726cdddf7aad0e61b7e98dc..71ba00e9934c6478a35fa4163b096076435c56d0 100644
--- a/oxrlib/commands/historical.py
+++ b/oxrlib/commands/historical.py
@@ -14,7 +14,7 @@ except ImportError:
 class Formatter:
     def __init__(self, cost_rates, price_rates=None,
                  signed_currencies=(), base_fmt='#,##0.###',
-                 rate_precision=5, denomination=None):
+                 rate_precision=6, denomination=None):
         self.cost_rates = cost_rates
         self.price_rates = price_rates
         self.base_fmt = base_fmt
@@ -95,27 +95,13 @@ class BeancountFormatter(Formatter):
             qrate = rate
         return qrate.normalize()
 
-    def normalize_enough(self, rate, curr, from_amt, to_amt, prec=None):
-        if prec is None:
-            prec = self.rate_prec
-        # Starting from prec, find the least amount of precision to
-        # make sure from_amt converts exactly to to_amt.
-        for try_prec in itertools.count(prec):
-            try_rate = self.normalize_rate(rate, try_prec)
-            got_amt = self.currency_decimal(from_amt * try_rate, curr)
-            # If got_amt == to_amt, this is enough precision to do the
-            # conversion exactly, so we're done.
-            # If try_rate == rate, there's no more precision available, so stop.
-            if (got_amt == to_amt) or (try_rate == rate):
-                break
-        return try_rate
-
-    def _pretty_rate(self, fmt, rate, curr, from_amt=None, to_amt=None):
-        if to_amt is None:
-            rate = self.normalize_rate(rate)
-        else:
-            rate = self.normalize_enough(rate, curr, from_amt, to_amt)
-        return fmt.format(self.format_currency(rate, curr, currency_digits=False))
+    def _pretty_rate(self, fmt, rate, curr):
+        rate_s = self.format_currency(
+            self.normalize_rate(rate),
+            curr,
+            currency_digits=False,
+        )
+        return fmt.format(rate_s)
 
     def format_rate_pair(self, from_curr, to_curr):
         from_amt = 1
@@ -151,12 +137,10 @@ class BeancountFormatter(Formatter):
         if price is None:
             price_s = ''
         else:
-            price_s = self._pretty_rate(
-                self.PRICE_FMT, price, denomination, amount, to_amt,
-            )
+            price_s = self._pretty_rate(self.PRICE_FMT, price, denomination)
         return "{} {}{}".format(
             amt_s,
-            self._pretty_rate(self.COST_FMT, cost, denomination, amount, to_amt),
+            self._pretty_rate(self.COST_FMT, cost, denomination),
             price_s,
         )