2 files changed, 4 insertions, 0 deletions
diff --git a/src/binary/Data/Binary/Builder.hs b/src/binary/Data/Binary/Builder.hs
index 183483945..6aee97964 100644
--- a/src/binary/Data/Binary/Builder.hs
+++ b/src/binary/Data/Binary/Builder.hs
@@ -55,6 +55,7 @@ module Data.Binary.Builder (
   ) where
 
 import Foreign
+import System.IO.Unsafe(unsafePerformIO)
 import Data.Monoid
 --import Data.Word
 import qualified Data.ByteString      as S
diff --git a/src/binary/Data/Binary/Get.hs b/src/binary/Data/Binary/Get.hs
index c2c43b691..0a2f12117 100644
--- a/src/binary/Data/Binary/Get.hs
+++ b/src/binary/Data/Binary/Get.hs
@@ -89,6 +89,9 @@ import Control.Applicative (Applicative(..))
 import Foreign
 
 -- used by splitAtST
+#if MIN_VERSION_base(4,6,0)
+import Control.Monad.ST.Unsafe(unsafeInterleaveST)
+#endif
 import Control.Monad.ST
 import Data.STRef