diff --git a/pkgs/development/haskell-modules/configuration-ghc-8.8.x.nix b/pkgs/development/haskell-modules/configuration-ghc-8.8.x.nix
index 0e9097db5ce3..8ff184cb2807 100644
--- a/pkgs/development/haskell-modules/configuration-ghc-8.8.x.nix
+++ b/pkgs/development/haskell-modules/configuration-ghc-8.8.x.nix
@@ -101,10 +101,6 @@ self: super: {
     url = "https://raw.githubusercontent.com/hvr/head.hackage/master/patches/regex-tdfa-1.2.3.1.patch";
     sha256 = "1lhas4s2ms666prb475gaw2bqw1v4y8cxi66sy20j727sx7ppjs7";
   });
-  cassava = appendPatch super.cassava (pkgs.fetchpatch {
-    url = "https://raw.githubusercontent.com/hvr/head.hackage/master/patches/cassava-0.5.1.0.patch";
-    sha256 = "11scwwjp94si90vb8v5yr291g9qwv5l223z8y0g0lc63932bp63g";
-  });
   shakespeare = appendPatch super.shakespeare (pkgs.fetchpatch {
     url = "https://raw.githubusercontent.com/hvr/head.hackage/master/patches/shakespeare-2.0.20.patch";
     sha256 = "1dgx41ylahj4wk8r422aik0d7qdpawdga4gqz905nvlnhqjla58y";