diff --git a/pkgs/development/tools/haskell/haskell-language-server/withWrapper.nix b/pkgs/development/tools/haskell/haskell-language-server/withWrapper.nix
index b55fd6aa6ba7..ff1f4323cead 100644
--- a/pkgs/development/tools/haskell/haskell-language-server/withWrapper.nix
+++ b/pkgs/development/tools/haskell/haskell-language-server/withWrapper.nix
@@ -22,6 +22,8 @@ let
       (haskell.lib.compose.overrideCabal (old: {
         enableSharedExecutables = dynamic;
         postInstall = ''
+          ${old.postInstall or ""}
+
           remove-references-to -t ${hsPkgs.ghc} $out/bin/haskell-language-server
           remove-references-to -t ${hsPkgs.shake.data} $out/bin/haskell-language-server
           remove-references-to -t ${hsPkgs.js-jquery.data} $out/bin/haskell-language-server