diff --git a/flake.nix b/flake.nix
index e37621c6fc1..7394c798d4f 100644
--- a/flake.nix
+++ b/flake.nix
@@ -23,7 +23,7 @@
           import ./nixos/lib/eval-config.nix (args // {
             modules = modules ++
               [ { system.nixos.versionSuffix =
-                    ".${lib.substring 0 8 (self.lastModifiedDate or self.lastModified)}.${self.shortRev or "dirty"}";
+                    "dirty"}";
                   system.nixos.revision = lib.mkIf (self ? rev) self.rev;
                 }
               ];