diff --git a/hledger-web/Hledger/Web/Handlers.hs b/hledger-web/Hledger/Web/Handlers.hs
index ce0d12c74..6aa47a75d 100644
--- a/hledger-web/Hledger/Web/Handlers.hs
+++ b/hledger-web/Hledger/Web/Handlers.hs
@@ -1,4 +1,4 @@
-{-# LANGUAGE TemplateHaskell, QuasiQuotes, OverloadedStrings, RecordWildCards #-}
+{-# LANGUAGE TemplateHaskell, QuasiQuotes, OverloadedStrings, RecordWildCards, CPP #-}
 {-
 
 hledger-web's request handlers, and helpers.