diff --git a/purescript.cabal b/purescript.cabal
--- a/purescript.cabal
+++ b/purescript.cabal
@@ -1,5 +1,5 @@
 name: purescript
-version: 0.5.6
+version: 0.5.6.1
 cabal-version: >=1.8
 build-type: Custom
 license: MIT
diff --git a/src/Language/PureScript/Parser/Declarations.hs b/src/Language/PureScript/Parser/Declarations.hs
--- a/src/Language/PureScript/Parser/Declarations.hs
+++ b/src/Language/PureScript/Parser/Declarations.hs
@@ -394,7 +394,7 @@
                                <*> (C.indented *> parseBinder)
 
 parseNullBinder :: P.Parsec String ParseState Binder
-parseNullBinder = C.lexeme (P.char '_') *> P.notFollowedBy C.identLetter *> return NullBinder
+parseNullBinder = C.lexeme (P.char '_' *> P.notFollowedBy C.identLetter) *> return NullBinder
 
 parseIdentifierAndBinder :: P.Parsec String ParseState (String, Binder)
 parseIdentifierAndBinder = do