diff --git a/flake.nix b/flake.nix
index 7617fb1..1d1793b 100644
--- a/flake.nix
+++ b/flake.nix
@@ -62,8 +62,8 @@
         // {
           inherit cargoArtifacts NIX_CMD_PATH NIX_INSTANTIATE_CMD_PATH;
           nativeCheckInputs = [pkgs.nix];
-          # tests use nix. can't do that in the sandbox.
-          doCheck = false;
+          # integration tests use nix. can't do that in the sandbox.
+          cargoTestExtraArgs = "--bins";
         }
       );