diff --git a/flake.nix b/flake.nix
index 5e54372..ea1735a 100644
--- a/flake.nix
+++ b/flake.nix
@@ -7,10 +7,7 @@
 
   outputs = { self, nixpkgs, utils }:
     {
-      overlay = final: prev: {
-        buildGoApplication = final.callPackage ./builder { };
-        gomod2nix = final.callPackage ./default.nix { };
-      };
+      overlay = import ./overlay.nix;
     } //
     (utils.lib.eachDefaultSystem
       (system:
diff --git a/overlay.nix b/overlay.nix
index ee38e64..617ce4f 100644
--- a/overlay.nix
+++ b/overlay.nix
@@ -1,4 +1,4 @@
-self: super: {
-  buildGoApplication = self.callPackage ./builder { };
-  gomod2nix = self.callPackage ./default.nix { };
+final: prev: {
+  buildGoApplication = final.callPackage ./builder { };
+  gomod2nix = final.callPackage ./default.nix { };
 }