diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,8 @@
+# Version 1.0.1
+
+* Add missing compiler pragma.
+
+
 # Version 1.0
 
 * This library contains some of what was in `di-0.3`, conceptually at least.
diff --git a/di-handle.cabal b/di-handle.cabal
--- a/di-handle.cabal
+++ b/di-handle.cabal
@@ -1,5 +1,5 @@
 name: di-handle
-version: 1.0
+version: 1.0.1
 author: Renzo Carbonara
 maintainer: renλren.zone
 copyright: Renzo Carbonara 2017-2018
diff --git a/lib/Di/Handle.hs b/lib/Di/Handle.hs
--- a/lib/Di/Handle.hs
+++ b/lib/Di/Handle.hs
@@ -1,4 +1,5 @@
 {-# LANGUAGE CPP #-}
+{-# LANGUAGE BangPatterns #-}
 
 module Di.Handle
  ( stderr