diff --git a/Data/Primitive/Array.hs b/Data/Primitive/Array.hs
--- a/Data/Primitive/Array.hs
+++ b/Data/Primitive/Array.hs
@@ -117,7 +117,8 @@
           -> Int                             -- ^ number of elements to copy
           -> m ()
 {-# INLINE copyArray #-}
-#if __GLASGOW_HASKELL__ >= 702
+#if __GLASGOW_HASKELL__ > 706
+-- NOTE: copyArray# and copyMutableArray# are slightly broken in GHC 7.6.* and earlier
 copyArray (MutableArray dst#) (I# doff#) (Array src#) (I# soff#) (I# len#)
   = primitive_ (copyArray# src# soff# dst# doff# len#)
 #else
@@ -140,7 +141,8 @@
           -> Int                             -- ^ number of elements to copy
           -> m ()
 {-# INLINE copyMutableArray #-}
-#if __GLASGOW_HASKELL__ >= 702
+#if __GLASGOW_HASKELL__ >= 706
+-- NOTE: copyArray# and copyMutableArray# are slightly broken in GHC 7.6.* and earlier
 copyMutableArray (MutableArray dst#) (I# doff#)
                  (MutableArray src#) (I# soff#) (I# len#)
   = primitive_ (copyMutableArray# src# soff# dst# doff# len#)
diff --git a/primitive.cabal b/primitive.cabal
--- a/primitive.cabal
+++ b/primitive.cabal
@@ -1,5 +1,5 @@
 Name:           primitive
-Version:        0.5
+Version:        0.5.0.1
 License:        BSD3
 License-File:   LICENSE
 Author:         Roman Leshchinskiy <rl@cse.unsw.edu.au>
@@ -11,6 +11,10 @@
 Description:
         .
         This package provides various primitive memory-related operations.
+        .
+        Changes in version 0.5.0.1
+        .
+        * Disable array copying primitives for GHC 7.6.* and earlier
         .
         Changes in version 0.5
         .