diff --git a/third_party/overlays/dhall/default.nix b/third_party/overlays/dhall/default.nix
index d944905e8..462503599 100644
--- a/third_party/overlays/dhall/default.nix
+++ b/third_party/overlays/dhall/default.nix
@@ -3,15 +3,6 @@
 self: super:
 
 let
-  dhall-source = subdir: pkg: super.haskell.lib.overrideSrc pkg {
-    src = "${super.fetchFromGitHub {
-      owner = "Profpatsch";
-      repo = "dhall-haskell";
-      # https://github.com/dhall-lang/dhall-haskell/pull/2426
-      rev = "82123817316192d39f9a3e68b8ce9c9cff0a48ed";
-      sha256 = "sha256-gbHoUKIdLPIttqeV471jsT8OJz6uiI6LpHOwtLbBGHY=";
-    }}/${subdir}";
-  };
 
   # binary releases of dhall tools, since the build in nixpkgs is
   # broken most of the time. The binaries are also fully static
@@ -25,13 +16,8 @@ let
       { pkgs = self; };
 in
 {
-  # TODO: this is to fix a bug in dhall-nix
-  haskellPackages = super.haskellPackages.override {
-    overrides = hsSelf: hsSuper: {
-      dhall = dhall-source "dhall" hsSuper.dhall;
-      dhall-nix = dhall-source "dhall-nix" hsSuper.dhall-nix;
-    };
-  };
+  # ATTN: see the haskell overlay for some overrides we need.
+
   # dhall = easy-dhall-nix.dhall-simple;
   # dhall-nix = easy-dhall-nix.dhall-nix-simple;
   dhall-bash = easy-dhall-nix.dhall-bash-simple;
diff --git a/third_party/overlays/haskell/default.nix b/third_party/overlays/haskell/default.nix
index 0ed0196a2..54d278a78 100644
--- a/third_party/overlays/haskell/default.nix
+++ b/third_party/overlays/haskell/default.nix
@@ -7,25 +7,35 @@
 self: super: # overlay parameters for the nixpkgs overlay
 
 let
-  overrides = hsSelf: hsSuper: with self.haskell.lib.compose; {
-    # No overrides for the default package set necessary at the moment
+  dhall-source = subdir: pkg: super.haskell.lib.overrideSrc pkg {
+    src = "${super.fetchFromGitHub {
+      owner = "Profpatsch";
+      repo = "dhall-haskell";
+      # https://github.com/dhall-lang/dhall-haskell/pull/2426
+      rev = "82123817316192d39f9a3e68b8ce9c9cff0a48ed";
+      sha256 = "sha256-gbHoUKIdLPIttqeV471jsT8OJz6uiI6LpHOwtLbBGHY=";
+    }}/${subdir}";
   };
+
+
 in
 {
   haskellPackages = super.haskellPackages.override {
-    inherit overrides;
+    overrides = hsSelf: hsSuper: {
+      # TODO: this is to fix a bug in dhall-nix
+      dhall = dhall-source "dhall" hsSuper.dhall;
+      dhall-nix = dhall-source "dhall-nix" hsSuper.dhall-nix;
+    };
   };
 
   haskell = lib.recursiveUpdate super.haskell {
     packages.ghc8107 = super.haskell.packages.ghc8107.override {
-      overrides = lib.composeExtensions overrides (
-        hsSelf: hsSuper: with self.haskell.lib.compose; {
-          # TODO(sterni): TODO(grfn): patch xanthous to work with random-fu 0.3.*,
-          # so we can use GHC 9.0.2 and benefit from upstream binary cache.
-          random-fu = hsSelf.callPackage ./extra-pkgs/random-fu-0.2.nix { };
-          rvar = hsSelf.callPackage ./extra-pkgs/rvar-0.2.nix { };
-        }
-      );
+      overrides = hsSelf: hsSuper: {
+        # TODO(sterni): TODO(grfn): patch xanthous to work with random-fu 0.3.*,
+        # so we can use GHC 9.0.2 and benefit from upstream binary cache.
+        random-fu = hsSelf.callPackage ./extra-pkgs/random-fu-0.2.nix { };
+        rvar = hsSelf.callPackage ./extra-pkgs/rvar-0.2.nix { };
+      };
     };
   };
 }