diff --git a/overlay.nix b/overlay.nix
index e9e3fe210d2f9c15b17baac4799022194160c421..9e8dd7fa4063b05ce33b50693963a42153d064c4 100644
--- a/overlay.nix
+++ b/overlay.nix
@@ -65,6 +65,7 @@ final: prev: with pkgs.haskell.lib; {
 
   citeproc = prev.callHackage "citeproc" "0.8.0.1" { };
 
+  co-log-core = doJailbreak (dontCheck (prev.callHackage "co-log-core" "0.3.1.0" { }));
 
   comonad = prev.callHackage "comonad" "5.0.8" { };