diff --git a/overlay.nix b/overlay.nix
index 9260f09f7731700e526fbb785c7a10d41bc23419..9f4194d557023ba0128627f645ac0c591db11735 100644
--- a/overlay.nix
+++ b/overlay.nix
@@ -153,6 +153,8 @@ final: prev: with pkgs.haskell.lib; {
 
   genvalidity-hspec = prev.callHackage "genvalidity-hspec" "1.0.0.2" { };
 
+  genvalidity-text = prev.callHackage "genvalidity-text" "1.0.0.1" { };
+
   ghc-check = dontHaddock (prev.callHackage "ghc-check" "0.5.0.8" { });
 
   ghc-byteorder = doJailbreak (prev.callHackage "ghc-byteorder" "4.11.0.0.10" { });