diff --git a/safecopy.cabal b/safecopy.cabal
--- a/safecopy.cabal
+++ b/safecopy.cabal
@@ -3,7 +3,7 @@
 -- http://www.haskell.org/cabal/release/cabal-latest/doc/users-guide/authors.html#pkg-descr.
 -- The name of the package.
 Name:                safecopy
-Version:             0.9.4.2
+Version:             0.9.4.3
 Synopsis:            Binary serialization with version control.
 Description:         An extension to Data.Serialize with built-in version control.
 Homepage:            https://github.com/acid-state/safecopy
diff --git a/src/Data/SafeCopy/Instances.hs b/src/Data/SafeCopy/Instances.hs
--- a/src/Data/SafeCopy/Instances.hs
+++ b/src/Data/SafeCopy/Instances.hs
@@ -41,6 +41,9 @@
 import           Data.Typeable
 #endif
 import           Data.Word
+#if MIN_VERSION_base(4,8,0)
+import           Numeric.Natural (Natural)
+#endif
 import           System.Time (ClockTime(..), TimeDiff(..), CalendarTime(..), Month(..))
 import qualified System.Time as OT
 import qualified Data.Vector as V
@@ -169,6 +172,10 @@
     getCopy = contain get; putCopy = contain . put; errorTypeName = typeName
 instance SafeCopy Integer where
     getCopy = contain get; putCopy = contain . put; errorTypeName = typeName
+#if MIN_VERSION_base(4,8,0)
+instance SafeCopy Natural where
+    getCopy = contain get; putCopy = contain . put; errorTypeName = typeName
+#endif
 
 -- | cereal change the formats for Float/Double in 0.5.*
 --