diff --git a/pkgs/development/haskell-modules/configuration-ghc-8.4.x.nix b/pkgs/development/haskell-modules/configuration-ghc-8.4.x.nix
index 9b9b1ca8e04..11de2835422 100644
--- a/pkgs/development/haskell-modules/configuration-ghc-8.4.x.nix
+++ b/pkgs/development/haskell-modules/configuration-ghc-8.4.x.nix
@@ -629,7 +629,6 @@ self: super: {
   # Older versions don't compile.
   brick = self.brick_0_35_1;
   HaTeX = self.HaTeX_3_19_0_0;
-  json = self.json_0_9_2;
   matrix = self.matrix_0_3_6_1;
   pandoc = self.pandoc_2_1_3;
   pandoc-types = self.pandoc-types_1_17_4_2;