diff --git a/flake.nix b/flake.nix
index 190d497..62c5763 100644
--- a/flake.nix
+++ b/flake.nix
@@ -15,20 +15,22 @@
         cargoToml = fromTOML (builtins.readFile ./Cargo.toml);
         name = cargoToml.package.name;
 
-        nativeBuildInputs = with pkgs; [
-          m4
-        ];
-      in
-      {
-        packages.default = pkgs.rustPlatform.buildRustPackage {
-          inherit name nativeBuildInputs;
+        crate = pkgs.rustPlatform.buildRustPackage {
+          inherit name;
           src = ./.;
 
           cargoLock.lockFile = ./Cargo.lock;
+
+          nativeBuildInputs = with pkgs; [
+            m4
+          ];
         };
+      in
+      {
+        packages.default = crate;
 
         devShells.default = pkgs.mkShell {
-          inherit nativeBuildInputs;
+          inputsFrom = [ crate ];
 
           packages = with pkgs; [
             rustc