diff --git a/genvalidity-time.cabal b/genvalidity-time.cabal
--- a/genvalidity-time.cabal
+++ b/genvalidity-time.cabal
@@ -1,18 +1,19 @@
--- This file has been generated from package.yaml by hpack version 0.20.0.
+-- This file has been generated from package.yaml by hpack version 0.28.2.
 --
 -- see: https://github.com/sol/hpack
 --
--- hash: 3ab04477a69e97392c72d90216817a0224ea9ca00e1f25c8deda7368f63c0864
+-- hash: 09c2e73a04279740d2caa8197cb474313ddaafec777e470f43a2076a0c70c2ea
 
 name:           genvalidity-time
-version:        0.2.0.2
+version:        0.2.1.0
 synopsis:       GenValidity support for time
 description:    Please see README.md
 category:       Testing
 homepage:       https://github.com/NorfairKing/validity#readme
 bug-reports:    https://github.com/NorfairKing/validity/issues
 author:         Tom Sydney Kerckhove
-maintainer:     syd.kerckhove@gmail.com
+maintainer:     syd.kerckhove@gmail.com,
+                nick.van.den.broeck666@gmail.com
 copyright:      Copyright: (c) 2017-2018 Tom Sydney Kerckhove
 license:        MIT
 license-file:   LICENSE
diff --git a/src/Data/GenValidity/Time/Clock.hs b/src/Data/GenValidity/Time/Clock.hs
--- a/src/Data/GenValidity/Time/Clock.hs
+++ b/src/Data/GenValidity/Time/Clock.hs
@@ -22,9 +22,12 @@
 
 instance GenUnchecked DiffTime where
     genUnchecked = picosecondsToDiffTime <$> genUnchecked
+#if MIN_VERSION_time(1,6,0)
     shrinkUnchecked =
         fmap picosecondsToDiffTime . shrinkUnchecked . diffTimeToPicoseconds
-
+#else
+    shrinkUnchecked = const []
+#endif
 instance GenValid DiffTime where
     genValid = picosecondsToDiffTime <$> genValid
 
@@ -42,6 +45,10 @@
 
 instance GenUnchecked NominalDiffTime where
     genUnchecked = diffUTCTime <$> genUnchecked <*> genUnchecked
-    shrinkUnchecked _ = []
-
+#if MIN_VERSION_time(1,9,0)
+    shrinkUnchecked =
+        fmap secondsToNominalDiffTime . shrinkUnchecked . nominalDiffTimeToSeconds
+#else
+    shrinkUnchecked = const []
+#endif
 instance GenValid NominalDiffTime
diff --git a/src/Data/GenValidity/Time/Format.hs b/src/Data/GenValidity/Time/Format.hs
--- a/src/Data/GenValidity/Time/Format.hs
+++ b/src/Data/GenValidity/Time/Format.hs
@@ -2,12 +2,12 @@
 {-# LANGUAGE CPP #-}
 
 module Data.GenValidity.Time.Format where
-
+#if MIN_VERSION_time(1,5,0)
 import Data.GenValidity
 import Data.GenValidity.Time.LocalTime ()
 import Data.Time.Format
 import Data.Validity.Time.Format ()
-#if MIN_VERSION_time(1,5,0)
+
 instance GenUnchecked TimeLocale where
     genUnchecked =
         TimeLocale <$> genUnchecked <*> genUnchecked <*> genUnchecked <*>