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-rw-r--r--pkgs/top-level/make-tarball.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/top-level/make-tarball.nix b/pkgs/top-level/make-tarball.nix
index abc121e29dc7..0f1c92be89bc 100644
--- a/pkgs/top-level/make-tarball.nix
+++ b/pkgs/top-level/make-tarball.nix
@@ -19,7 +19,7 @@ pkgs.releaseTools.sourceTarball {
versionSuffix = "pre${
if nixpkgs ? lastModified
then builtins.substring 0 8 (nixpkgs.lastModifiedDate or nixpkgs.lastModified)
- else toString nixpkgs.revCount}.${nixpkgs.shortRev or "dirty"}";
+ else toString (nixpkgs.revCount or 0)}.${nixpkgs.shortRev or "dirty"}";
buildInputs = with pkgs; [ nix.out jq lib-tests brotli ];