diff --git a/hledger-lib/Hledger/Data/Utils.hs b/hledger-lib/Hledger/Data/Utils.hs
index a3ef1c5c6..54275606a 100644
--- a/hledger-lib/Hledger/Data/Utils.hs
+++ b/hledger-lib/Hledger/Data/Utils.hs
@@ -282,6 +282,7 @@ tracewith f e = trace (f e) e
 
 -- parsing
 
+choice' :: [GenParser tok st a] -> GenParser tok st a
 choice' = choice . map Text.ParserCombinators.Parsec.try
 
 parsewith :: Parser a -> String -> Either ParseError a