diff --git a/hledger-lib/Hledger/Utils/UTF8IOCompat.hs b/hledger-lib/Hledger/Utils/UTF8IOCompat.hs
index 9988d26f7..7aa0232cc 100644
--- a/hledger-lib/Hledger/Utils/UTF8IOCompat.hs
+++ b/hledger-lib/Hledger/Utils/UTF8IOCompat.hs
@@ -1,4 +1,4 @@
-{-# LANGUAGE CPP #-}
+-- {-# LANGUAGE CPP #-}
 {- |
 
 UTF-8 aware string IO functions that will work across multiple platforms