diff --git a/pkgs/development/haskell-modules/configuration-ghc-8.6.x.nix b/pkgs/development/haskell-modules/configuration-ghc-8.6.x.nix
index c29c89d69f4f..088e2d5f9ce8 100644
--- a/pkgs/development/haskell-modules/configuration-ghc-8.6.x.nix
+++ b/pkgs/development/haskell-modules/configuration-ghc-8.6.x.nix
@@ -41,9 +41,6 @@ self: super: {
   unix = null;
   xhtml = null;
 
-  # Use to be a core-library, but no longer is since GHC 8.4.x.
-  hoopl = self.hoopl_3_10_2_2;
-
   # LTS-12.x versions do not compile.
   # base-orphans = self.base-orphans_0_8;
   # brick = self.brick_0_45;