diff --git a/pkgs/top-level/haskell-defaults.nix b/pkgs/top-level/haskell-defaults.nix
index 45c3ab9cb953..afc70019b0ff 100644
--- a/pkgs/top-level/haskell-defaults.nix
+++ b/pkgs/top-level/haskell-defaults.nix
@@ -27,6 +27,7 @@
   };
 
   ghc763Prefs = self : super : ghc783Prefs self super // {
+    aeson = self.aeson_0_7_0_4;
     ariadne = super.ariadne.override {
       haskellNames = self.haskellNames.override {
         haskellPackages = self.haskellPackages.override { Cabal = self.Cabal_1_18_1_3; };