diff --git a/nixos/modules/security/rngd.nix b/nixos/modules/security/rngd.nix
index 3a1ffc55e5fe..81e04a44b115 100644
--- a/nixos/modules/security/rngd.nix
+++ b/nixos/modules/security/rngd.nix
@@ -30,7 +30,7 @@ with lib;
 
       description = "Hardware RNG Entropy Gatherer Daemon";
 
-      serviceConfig.ExecStart = "${pkgs.rng_tools}/sbin/rngd -f -v" +
+      serviceConfig.ExecStart = "${pkgs.rng-tools}/sbin/rngd -f -v" +
         (if config.services.tcsd.enable then " --no-tpm=1" else "");
     };
   };