diff --git a/flake.nix b/flake.nix
index 96ffb21..5c79705 100644
--- a/flake.nix
+++ b/flake.nix
@@ -146,6 +146,7 @@
           };
           rstcheck = {
             enable = true;
+            package = pkgs.rstcheckWithSphinx;
             entry = lib.getExe pkgs.rstcheckWithSphinx;
             files = "\\.rst$";
           };
@@ -170,6 +171,7 @@
           # sieve
           check-sieve = {
             enable = true;
+            package = pkgs.check-sieve;
             entry = lib.getExe pkgs.check-sieve;
             files = "\\.sieve$";
           };