diff --git a/flake.nix b/flake.nix
index 2e8ed0794..01013e219 100644
--- a/flake.nix
+++ b/flake.nix
@@ -29,12 +29,28 @@
 
           buildInputs = with pkgs; [ openssl ] ++ osxDependencies;
           nativeBuildInputs = with pkgs; [ pkg-config openssl.dev ];
-          cargoBuildFlags = [ "--package aiken" ];
 
-          src = pkgs.lib.cleanSourceWith { src = self; };
+          src = pkgs.lib.cleanSourceWith {
+            filter = name: type: builtins.elem (baseNameOf name) [ "target" ];
+            src = ./.;
+          };
+
+          # Tests might be impure and we shouldn't need to run them.
+          doCheck = false;
 
           cargoLock.lockFile = ./Cargo.lock;
 
+          buildPhase = ''
+            cargo build --release
+          '';
+
+          installPhase = ''
+            find . -type f ! -executable -name "aiken" -delete
+
+            mkdir -p $out/bin
+            install -Dm755 target/release/aiken $out/bin
+          '';
+
           meta = with pkgs.lib; {
             description = "Cardano smart contract language and toolchain";
             homepage = "https://github.com/aiken-lang/aiken";