diff --git a/Data/Stream/Infinite/Skew.hs b/Data/Stream/Infinite/Skew.hs
--- a/Data/Stream/Infinite/Skew.hs
+++ b/Data/Stream/Infinite/Skew.hs
@@ -61,7 +61,7 @@
 
 data Complete a 
     = Tip a
-    | Bin {-# UNPACK #-} !Integer a !(Complete a) !(Complete a)
+    | Bin !Integer a !(Complete a) !(Complete a)
     deriving Show
 
 instance Functor Complete where
diff --git a/streams.cabal b/streams.cabal
--- a/streams.cabal
+++ b/streams.cabal
@@ -1,6 +1,6 @@
 name:          streams
 category:      Control, Comonads
-version:       0.5.1.1
+version:       0.5.1.2
 license:       BSD3
 cabal-version: >= 1.6
 license-file:  LICENSE
@@ -63,6 +63,10 @@
   .
   * "Data.Stream.Supply" provides a comonadic supply of unique values, which are
     generated impurely as the tree is explored.
+  .
+  /Changes since 0.5.1/:
+  .
+  * Removed a redundant UNPACK pragma
   .
   /Changes since 0.5/:
   .