diff --git a/hledger-lib/Hledger/Data/Journal.hs b/hledger-lib/Hledger/Data/Journal.hs
index bf6986f14..9969d28af 100644
--- a/hledger-lib/Hledger/Data/Journal.hs
+++ b/hledger-lib/Hledger/Data/Journal.hs
@@ -552,7 +552,7 @@ checkBalanceAssertion p@Posting{ pbalanceassertion = Just (ass,_)} amt
             (case ptransaction p of
                Nothing -> ":" -- shouldn't happen
                Just t ->  printf " in %s:\nin transaction:\n%s"
-                          (showGenericSourcePos pos) (chomp $ show t) :: String
+                          (showGenericSourcePos pos) (chomp $ showTransaction t) :: String
                             where pos = snd $ fromJust $ pbalanceassertion p)
             (showPostingLine p)
             (showDate $ postingDate p)