diff --git a/src/Data/Singletons/CustomStar.hs b/src/Data/Singletons/CustomStar.hs
index ec75b074..f2c04d16 100644
--- a/src/Data/Singletons/CustomStar.hs
+++ b/src/Data/Singletons/CustomStar.hs
@@ -1,4 +1,4 @@
-{-# LANGUAGE DataKinds, TypeFamilies, KindSignatures, TemplateHaskell, CPP #-}
+{-# LANGUAGE DataKinds, TypeFamilies, KindSignatures, TemplateHaskell #-}
 
 -----------------------------------------------------------------------------
 -- |
diff --git a/src/Data/Singletons/Single.hs b/src/Data/Singletons/Single.hs
index c119a390..7566b0de 100644
--- a/src/Data/Singletons/Single.hs
+++ b/src/Data/Singletons/Single.hs
@@ -6,7 +6,7 @@ rae@cs.brynmawr.edu
 This file contains functions to refine constructs to work with singleton
 types. It is an internal module to the singletons package.
 -}
-{-# LANGUAGE TemplateHaskell, TupleSections, ParallelListComp, CPP #-}
+{-# LANGUAGE TemplateHaskell, TupleSections, ParallelListComp #-}
 
 module Data.Singletons.Single where
 
diff --git a/src/Data/Singletons/TH.hs b/src/Data/Singletons/TH.hs
index ccf34bf2..8b848479 100644
--- a/src/Data/Singletons/TH.hs
+++ b/src/Data/Singletons/TH.hs
@@ -1,4 +1,4 @@
-{-# LANGUAGE ExplicitNamespaces, CPP #-}
+{-# LANGUAGE ExplicitNamespaces #-}
 
 -----------------------------------------------------------------------------
 -- |
diff --git a/tests/SingletonsTestSuiteUtils.hs b/tests/SingletonsTestSuiteUtils.hs
index d9fed775..80c931cf 100644
--- a/tests/SingletonsTestSuiteUtils.hs
+++ b/tests/SingletonsTestSuiteUtils.hs
@@ -1,4 +1,3 @@
-{-# LANGUAGE CPP #-}
 {-# LANGUAGE DeriveAnyClass #-}
 {-# LANGUAGE DerivingStrategies #-}
 {-# LANGUAGE GeneralizedNewtypeDeriving #-}