diff --git a/ghc-prerelease.nix b/ghc-prerelease.nix
index f8f79b3bb61ff5ec14cf5901ca9134f981b34d2f..8df1cc8a91addcda2b36779fbd1025bc8bebab3a 100644
--- a/ghc-prerelease.nix
+++ b/ghc-prerelease.nix
@@ -12,8 +12,10 @@ let spec =
   };
 in
 
-(nixpkgs.haskell.compiler.ghcHEAD.override
-    { version = spec.version
-    ; bootPkgs = nixpkgs.haskell.packages.ghc822; }).overrideAttrs(oldAttrs:
-    { src = spec.src; })
+(nixpkgs.haskell.compiler.ghcHEAD.override {
+  version = spec.version;
+  bootPkgs = nixpkgs.haskell.packages.ghc865;
+}).overrideAttrs(oldAttrs: {
+  src = spec.src;
+})