diff --git a/src/Conv.hs b/src/Conv.hs
index 2b092b56f..99826e127 100644
--- a/src/Conv.hs
+++ b/src/Conv.hs
@@ -1,6 +1,6 @@
-{-# LANGUAGE TypeSynonymInstances #-}
+{-# LANGUAGE Trustworthy #-}
 {-# LANGUAGE FlexibleInstances #-}
-
+{-# LANGUAGE TypeSynonymInstances #-}
 
 module Conv (
   StringConv (..)
diff --git a/src/Debug.hs b/src/Debug.hs
index 1266aa06f..42be4c443 100644
--- a/src/Debug.hs
+++ b/src/Debug.hs
@@ -1,4 +1,4 @@
-{-# LANGUAGE Unsafe #-}
+{-# LANGUAGE Trustworthy #-}
 {-# LANGUAGE NoImplicitPrelude #-}
 
 module Debug (
diff --git a/src/Functor.hs b/src/Functor.hs
index 5f228b501..87d6bf349 100644
--- a/src/Functor.hs
+++ b/src/Functor.hs
@@ -1,4 +1,5 @@
 {-# LANGUAGE CPP #-}
+{-# LANGUAGE Safe #-}
 {-# LANGUAGE NoImplicitPrelude #-}
 
 module Functor (
diff --git a/src/Panic.hs b/src/Panic.hs
index 863feddb9..19e994ebf 100644
--- a/src/Panic.hs
+++ b/src/Panic.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE Trustworthy #-}
 {-# LANGUAGE DeriveDataTypeable #-}
 
 module Panic (