diff --git a/flake.nix b/flake.nix
index d9cefee4..2c5324f3 100644
--- a/flake.nix
+++ b/flake.nix
@@ -198,7 +198,7 @@
           name = package.pname;
           tag = "main";
           # Debian makes builds reproducible through using the HEAD commit's date
-          created = self.lastModified;
+          created = self.lastModifiedDate;
           copyToRoot = [
             pkgs.dockerTools.caCertificates
           ];