diff --git a/hledger-lib/Hledger/Reports/MultiBalanceReport.hs b/hledger-lib/Hledger/Reports/MultiBalanceReport.hs
index 7dee4bf8f..644066824 100644
--- a/hledger-lib/Hledger/Reports/MultiBalanceReport.hs
+++ b/hledger-lib/Hledger/Reports/MultiBalanceReport.hs
@@ -166,7 +166,7 @@ compoundBalanceReportWith ropts q j priceoracle subreportspecs = cbr
         (r:rs) -> sconcat $ fmap subreportTotal (r:|rs)
       where
         subreportTotal (_, sr, increasestotal) =
-            (if increasestotal then id else prrNegate) $ prTotals sr
+            (if increasestotal then id else fmap negate) $ prTotals sr
 
     cbr = CompoundPeriodicReport "" colspans subreports overalltotals
 
@@ -523,11 +523,10 @@ calculateTotalsRow ropts rows =
 
 -- | Map the report rows to percentages and negate if needed
 postprocessReport :: ReportOpts -> MultiBalanceReport -> MultiBalanceReport
-postprocessReport ropts =
-    maybeInvert . maybePercent
+postprocessReport ropts = maybePercent . maybeInvert
   where
-    maybeInvert  = if invert_  ropts then prNegate  else id
-    maybePercent = if percent_ ropts then prPercent else id
+    maybeInvert  = if invert_  ropts then fmap negate else id
+    maybePercent = if percent_ ropts then prPercent   else id
 
     prPercent (PeriodicReport spans rows totalrow) =
         PeriodicReport spans (map percentRow rows) (percentRow totalrow)
diff --git a/hledger-lib/Hledger/Reports/ReportTypes.hs b/hledger-lib/Hledger/Reports/ReportTypes.hs
index bb43aef32..7f2f09544 100644
--- a/hledger-lib/Hledger/Reports/ReportTypes.hs
+++ b/hledger-lib/Hledger/Reports/ReportTypes.hs
@@ -17,13 +17,10 @@ module Hledger.Reports.ReportTypes
 , Average
 
 , periodicReportSpan
-, prNegate
 , prNormaliseSign
 , prMapName
 , prMapMaybeName
 
-, prrNegate
-
 , CompoundPeriodicReport(..)
 , CBCSubreportSpec(..)
 
@@ -115,18 +112,8 @@ periodicReportSpan (PeriodicReport colspans _ _) = DateSpan (spanStart $ head co
 -- | Given a PeriodicReport and its normal balance sign,
 -- if it is known to be normally negative, convert it to normally positive.
 prNormaliseSign :: Num b => NormalSign -> PeriodicReport a b -> PeriodicReport a b
-prNormaliseSign NormallyNegative = prNegate
-prNormaliseSign _ = id
-
--- | Flip the sign of all amounts in a PeriodicReport.
-prNegate :: Num b => PeriodicReport a b -> PeriodicReport a b
-prNegate (PeriodicReport colspans rows totalsrow) =
-    PeriodicReport colspans (map prrNegate rows) (prrNegate totalsrow)
-
--- | Flip the sign of all amounts in a PeriodicReportRow.
-prrNegate :: Num b => PeriodicReportRow a b -> PeriodicReportRow a b
-prrNegate (PeriodicReportRow name amts tot avg) =
-    PeriodicReportRow name (map negate amts) (-tot) (-avg)
+prNormaliseSign NormallyNegative = fmap negate
+prNormaliseSign NormallyPositive = id
 
 -- | Map a function over the row names.
 prMapName :: (a -> b) -> PeriodicReport a c -> PeriodicReport b c