diff --git a/shell.nix b/shell.nix
index d3bf73799..1fa25de79 100644
--- a/shell.nix
+++ b/shell.nix
@@ -92,6 +92,7 @@ let
   ghc = haskellPackages.ghcWithPackages haskellDeps;
 
   nixPackages = [
+    pkgs.zlib
     ghc
     pkgs.gdb
     haskellPackages.ghcid