diff --git a/Text/ParserCombinators/Incremental.hs b/Text/ParserCombinators/Incremental.hs
--- a/Text/ParserCombinators/Incremental.hs
+++ b/Text/ParserCombinators/Incremental.hs
@@ -170,12 +170,12 @@
             | otherwise       = append p1 p2
 
 appendIncremental :: (Monoid s, Semigroup r) => Parser t s r -> Parser t s r -> Parser t s r
-appendIncremental (Result s r) p = resultPart (<> r) (feed s p)
+appendIncremental (Result s r) p = resultPart (r <>) (feed s p)
 appendIncremental (ResultPart r e f) p2 = ResultPart r (appendIncremental e p2) (flip appendIncremental p2 . f)
 appendIncremental p1 p2 = apply (`appendIncremental` p2) p1
 
 append :: (Monoid s, Semigroup r) => Parser t s r -> Parser t s r -> Parser t s r
-append (Result s r) p2 = prepend (<> r) (feed s p2)
+append (Result s r) p2 = prepend (r <>) (feed s p2)
 append p1 p2 = apply (`append` p2) p1
 
 -- | Two parsers can be sequentially joined.
diff --git a/incremental-parser.cabal b/incremental-parser.cabal
--- a/incremental-parser.cabal
+++ b/incremental-parser.cabal
@@ -1,5 +1,5 @@
 Name:                incremental-parser
-Version:             0.3.2.1
+Version:             0.3.2.2
 Cabal-Version:       >= 1.10
 Build-Type:          Simple
 Synopsis:            Generic parser library capable of providing partial results from partial input.
@@ -37,7 +37,7 @@
   x-uses-tf:         true
   Default-Language:  Haskell2010
   Build-Depends:     base < 5, monoid-subclasses < 0.5,
-                     QuickCheck >= 2 && < 3, checkers >= 0.3.2 && < 0.5,
+                     QuickCheck >= 2 && < 3, checkers >= 0.3.2 && < 0.6,
                      tasty >= 0.7 && < 1.3, tasty-quickcheck >= 0.7 && < 1.0
   Main-is:           Test/TestIncrementalParser.hs
   Other-Modules:     Text.ParserCombinators.Incremental,