diff --git a/plugins/hls-cabal-fmt-plugin/hls-cabal-fmt-plugin.cabal b/plugins/hls-cabal-fmt-plugin/hls-cabal-fmt-plugin.cabal
index c51012e712..7b2f7219de 100644
--- a/plugins/hls-cabal-fmt-plugin/hls-cabal-fmt-plugin.cabal
+++ b/plugins/hls-cabal-fmt-plugin/hls-cabal-fmt-plugin.cabal
@@ -23,7 +23,7 @@ flag isolateTests
   manual:      True
 
 common warnings
-  ghc-options: -Wall
+  ghc-options: -Wall -Wunused-packages
 
 library
   import:           warnings
@@ -40,7 +40,6 @@ library
     , mtl
     , process-extras
     , text
-    , transformers
 
   default-language: Haskell2010