diff --git a/human-readable-duration.cabal b/human-readable-duration.cabal
--- a/human-readable-duration.cabal
+++ b/human-readable-duration.cabal
@@ -1,6 +1,6 @@
 cabal-version: >=1.10
 name: human-readable-duration
-version: 0.2.1.3
+version: 0.2.1.4
 license: BSD3
 license-file: LICENSE
 maintainer: yann.esposito@gmail.com
@@ -50,6 +50,7 @@
         base >=4.7 && <5,
         Glob >=0.7,
         human-readable-duration -any,
+        time >=1.8.0.2,
         doctest >=0.9.12
 
 benchmark hrd-bench