diff --git a/hledger-lib/Hledger/Reports/ReportOptions.hs b/hledger-lib/Hledger/Reports/ReportOptions.hs
index 2e06b4263..fbdb7745f 100644
--- a/hledger-lib/Hledger/Reports/ReportOptions.hs
+++ b/hledger-lib/Hledger/Reports/ReportOptions.hs
@@ -13,6 +13,7 @@ Options common to most hledger reports.
 {-# LANGUAGE RecordWildCards       #-}
 {-# LANGUAGE TemplateHaskell       #-}
 {-# LANGUAGE TypeFamilies          #-}
+{-# LANGUAGE TypeOperators #-}
 
 module Hledger.Reports.ReportOptions (
   ReportOpts(..),
diff --git a/hledger-lib/Hledger/Utils/Parse.hs b/hledger-lib/Hledger/Utils/Parse.hs
index 828619581..3fa87d048 100644
--- a/hledger-lib/Hledger/Utils/Parse.hs
+++ b/hledger-lib/Hledger/Utils/Parse.hs
@@ -1,5 +1,6 @@
 {-# LANGUAGE FlexibleContexts #-}
 {-# LANGUAGE TypeFamilies #-}
+{-# LANGUAGE TypeOperators #-}
 
 module Hledger.Utils.Parse (
   SimpleStringParser,
diff --git a/hledger/Hledger/Cli/CliOptions.hs b/hledger/Hledger/Cli/CliOptions.hs
index 3325a7429..93e1fbe0c 100644
--- a/hledger/Hledger/Cli/CliOptions.hs
+++ b/hledger/Hledger/Cli/CliOptions.hs
@@ -12,6 +12,7 @@ related utilities used by hledger commands.
 {-# LANGUAGE ScopedTypeVariables #-}
 {-# LANGUAGE TemplateHaskell     #-}
 {-# LANGUAGE TypeFamilies        #-}
+{-# LANGUAGE TypeOperators       #-}
 
 module Hledger.Cli.CliOptions (