diff --git a/overlays/extern/default.nix b/overlays/extern/default.nix
new file mode 100644
index 0000000..8897dfb
--- /dev/null
+++ b/overlays/extern/default.nix
@@ -0,0 +1,3 @@
+{ channels, ... }: final: prev: {
+  inherit (channels.nixpkgs.nixsgx) sgx-psw;
+}
diff --git a/overlays/nixsgx/default.nix b/overlays/nixsgx/default.nix
deleted file mode 100644
index cdd3da6..0000000
--- a/overlays/nixsgx/default.nix
+++ /dev/null
@@ -1 +0,0 @@
-{ channels, ... }: final: prev: { inherit (channels.nixpkgs.nixsgx) sgx-psw; }