diff --git a/hlint.cabal b/hlint.cabal
--- a/hlint.cabal
+++ b/hlint.cabal
@@ -1,7 +1,7 @@
 cabal-version:      >= 1.6
 build-type:         Simple
 name:               hlint
-version:            1.8.54
+version:            1.8.55
 license:            BSD3
 license-file:       LICENSE
 category:           Development
diff --git a/src/Hint/Extensions.hs b/src/Hint/Extensions.hs
--- a/src/Hint/Extensions.hs
+++ b/src/Hint/Extensions.hs
@@ -53,6 +53,10 @@
 deriving instance Show Bar -- {-# LANGUAGE StandaloneDeriving #-}
 {-# LANGUAGE DeriveGeneric, GeneralizedNewtypeDeriving #-} \
 newtype Micro = Micro Int deriving Generic -- {-# LANGUAGE DeriveGeneric #-}
+{-# LANGUAGE UnboxedTuples #-} \
+f :: Int -> (# Int, Int #)
+{-# LANGUAGE UnboxedTuples #-} \
+f :: x -> (x, x); f x = (x, x) --
 </TEST>
 -}
 
@@ -120,7 +124,7 @@
 used PatternSignatures = hasS isPatTypeSig
 used RecordWildCards = hasS isPFieldWildcard & hasS isFieldWildcard
 used RecordPuns = hasS isPFieldPun & hasS isFieldPun
-used UnboxedTuples = has isBoxed
+used UnboxedTuples = has (not . isBoxed)
 used PackageImports = hasS (isJust . importPkg)
 used QuasiQuotes = hasS isQuasiQuote
 used ViewPatterns = hasS isPViewPat