diff --git a/hledger-lib/Hledger/Data/Amount.hs b/hledger-lib/Hledger/Data/Amount.hs
index 9dfeee123..43051fbe5 100644
--- a/hledger-lib/Hledger/Data/Amount.hs
+++ b/hledger-lib/Hledger/Data/Amount.hs
@@ -357,7 +357,7 @@ amountSetFullPrecision a = amountSetPrecision p a
 -- Rounding is done with Data.Decimal's default roundTo function:
 -- "If the value ends in 5 then it is rounded to the nearest even value (Banker's Rounding)".
 -- Does not change the amount's display precision.
--- Intended only for internal use, eg when comparing amounts in tests.
+-- Intended mainly for internal use, eg when comparing amounts in tests.
 setAmountInternalPrecision :: Word8 -> Amount -> Amount
 setAmountInternalPrecision p a@Amount{ aquantity=q, astyle=s } = a{
    astyle=s{asprecision=Precision p}
@@ -365,7 +365,7 @@ setAmountInternalPrecision p a@Amount{ aquantity=q, astyle=s } = a{
   }
 
 -- | Set an amount's internal precision, flipped.
--- Intended only for internal use, eg when comparing amounts in tests.
+-- Intended mainly for internal use, eg when comparing amounts in tests.
 withInternalPrecision :: Amount -> Word8 -> Amount
 withInternalPrecision = flip setAmountInternalPrecision
 
diff --git a/hledger-lib/Hledger/Data/Timeclock.hs b/hledger-lib/Hledger/Data/Timeclock.hs
index 8e121d6f7..7b67017dd 100644
--- a/hledger-lib/Hledger/Data/Timeclock.hs
+++ b/hledger-lib/Hledger/Data/Timeclock.hs
@@ -121,7 +121,11 @@ entryFromTimeclockInOut i o
       showtime = take 5 . show
       hours    = elapsedSeconds (toutc otime) (toutc itime) / 3600 where toutc = localTimeToUTC utc
       acctname = tlaccount i
-      amount   = mixedAmount $ hrs hours
+      -- Generate an hours amount. Unusually, we also round the internal Decimal value,
+      -- since otherwise it will often have large recurring decimal parts which (since 1.21)
+      -- print would display all 255 digits of. timeclock amounts have one second resolution,
+      -- so two decimal places is precise enough (#1527).
+      amount   = mixedAmount $ setAmountInternalPrecision 2 $ hrs hours
       ps       = [posting{paccount=acctname, pamount=amount, ptype=VirtualPosting, ptransaction=Just t}]
 
 
diff --git a/hledger/test/timeclock.test b/hledger/test/timeclock.test
index 765a7d9e2..a66557074 100644
--- a/hledger/test/timeclock.test
+++ b/hledger/test/timeclock.test
@@ -65,6 +65,17 @@ $ hledger -f timeclock:- balance
 >2 /line 2: expected timeclock code o/
 >= !0
 
+# Timeclock amounts are always rounded to two decimal places, 
+# even when displayed by print (#1527).
+<
+i 2020-01-30 08:38:35 a
+o 2020-01-30 09:03:35
+$ hledger -f timeclock:- print
+2020-01-30 * 08:38-09:03
+    (a)           0.42h
+
+>=
+
 ## TODO
 ## multi-day sessions get a new transaction for each day
 #hledger -ftimeclock:- print