diff --git a/flake.nix b/flake.nix
index 5f420ca..915dc0f 100644
--- a/flake.nix
+++ b/flake.nix
@@ -80,10 +80,6 @@
       ];
     };
 
-    devShells.${system}.default = with pkgs; mkShell {
-      packages = [
-        just
-      ];
-    };
+    devShells.${system}.default = pkgs.callPackage ./shell.nix {};
   };
 }
diff --git a/shell.nix b/shell.nix
new file mode 100644
index 0000000..b2a5826
--- /dev/null
+++ b/shell.nix
@@ -0,0 +1,8 @@
+{ pkgs ? import <nixpkgs> {} }:
+
+with pkgs;
+mkShell {
+  packages = [
+    just
+  ];
+}