diff --git a/contrib/package/nix/overlay.nix b/contrib/package/nix/overlay.nix
new file mode 100644
index 00000000..ca8d5c6e
--- /dev/null
+++ b/contrib/package/nix/overlay.nix
@@ -0,0 +1,11 @@
+final: prev: {
+  copyparty = final.python3.pkgs.callPackage ./copyparty {
+    ffmpeg = final.ffmpeg-full;
+  };
+
+  python3 = prev.python3.override {
+    packageOverrides = pyFinal: pyPrev: {
+      partftpy = pyFinal.callPackage ./partftpy { };
+    };
+  };
+}
diff --git a/flake.nix b/flake.nix
index c5181bfe..336642ee 100644
--- a/flake.nix
+++ b/flake.nix
@@ -12,16 +12,7 @@
     }:
     {
       nixosModules.default = ./contrib/nixos/modules/copyparty.nix;
-      overlays.default = final: prev: {
-        copyparty = final.python3.pkgs.callPackage ./contrib/package/nix/copyparty {
-          ffmpeg = final.ffmpeg-full;
-        };
-        python3 = prev.python3.override {
-          packageOverrides = pyFinal: pyPrev: {
-            partftpy = pyFinal.callPackage ./contrib/package/nix/partftpy { };
-          };
-        };
-      };
+      overlays.default = import ./contrib/package/nix/overlay.nix;
     }
     // flake-utils.lib.eachDefaultSystem (
       system: