diff --git a/maintainers/scripts/haskell/update-cabal2nix-unstable.sh b/maintainers/scripts/haskell/update-cabal2nix-unstable.sh
index c310b4b8145d..b81592b35fc7 100755
--- a/maintainers/scripts/haskell/update-cabal2nix-unstable.sh
+++ b/maintainers/scripts/haskell/update-cabal2nix-unstable.sh
@@ -1,5 +1,5 @@
 #! /usr/bin/env nix-shell
-#! nix-shell -i bash -p coreutils curl jq gnused haskellPackages.cabal2nix-unstable.bin -I nixpkgs=.
+#! nix-shell -i bash -p coreutils curl jq gnused haskellPackages.cabal2nix-unstable.bin nix-prefetch-scripts -I nixpkgs=.
 
 # Updates cabal2nix-unstable to the latest master of the nixos/cabal2nix repository.
 # See regenerate-hackage-packages.sh for details on the purpose of this script.
diff --git a/pkgs/development/haskell-modules/configuration-nix.nix b/pkgs/development/haskell-modules/configuration-nix.nix
index d6ecac6df3eb..e06ed946f481 100644
--- a/pkgs/development/haskell-modules/configuration-nix.nix
+++ b/pkgs/development/haskell-modules/configuration-nix.nix
@@ -1260,21 +1260,6 @@ builtins.intersectAttrs super {
   # not used to link against by anyone, we can make it’s closure smaller and
   # add its runtime dependencies in `haskellPackages` (as opposed to cabal2nix).
   cabal2nix-unstable = overrideCabal (drv: {
-    buildTools = (drv.buildTools or [ ]) ++ [
-      pkgs.buildPackages.makeWrapper
-    ];
-    postInstall = ''
-      ${drv.postInstall or ""}
-
-      wrapProgram $out/bin/cabal2nix \
-        --prefix PATH ":" "${
-          pkgs.lib.makeBinPath [
-            pkgs.nix
-            pkgs.nix-prefetch-scripts
-          ]
-        }"
-    '';
-
     passthru = drv.passthru or { } // {
       updateScript = ../../../maintainers/scripts/haskell/update-cabal2nix-unstable.sh;
 
diff --git a/pkgs/development/tools/purescript/spago/update.sh b/pkgs/development/tools/purescript/spago/update.sh
index 7f8de2da7360..51988546262e 100755
--- a/pkgs/development/tools/purescript/spago/update.sh
+++ b/pkgs/development/tools/purescript/spago/update.sh
@@ -1,5 +1,5 @@
 #!/usr/bin/env nix-shell
-#!nix-shell -i bash -p cabal2nix curl jq haskellPackages.cabal2nix-unstable.bin -I nixpkgs=.
+#!nix-shell -i bash -p cabal2nix curl jq haskellPackages.cabal2nix-unstable.bin nix-prefetch-scripts -I nixpkgs=.
 #
 # This script will update the spago derivation to the latest version using
 # cabal2nix.