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-rw-r--r--flake.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/flake.nix b/flake.nix
index 8440c460b16..cf0185d3ad6 100644
--- a/flake.nix
+++ b/flake.nix
@@ -45,7 +45,7 @@
               modules ++ [
                 {
                   system.nixos.versionSuffix =
-                    ".${final.substring 0 8 (self.lastModifiedDate or self.lastModified)}.${self.shortRev or "dirty"}";
+                    ".${final.substring 0 8 (self.lastModifiedDate or self.lastModified or "19700101")}.${self.shortRev or "dirty"}";
                   system.nixos.revision = final.mkIf (self ? rev) self.rev;
 
                   system.build = {