diff --git a/ci/eval/compare/default.nix b/ci/eval/compare/default.nix
index 571e6ba41068..9791d26e9550 100644
--- a/ci/eval/compare/default.nix
+++ b/ci/eval/compare/default.nix
@@ -230,6 +230,7 @@ runCommand "compare"
     echo "This PR touches ''${#touchedFiles[@]} files"
 
     # TODO: Move ci/OWNERS to Nix and produce owners.json instead of owners.txt.
+    touch "$out/owners.txt"
     for file in "''${touchedFiles[@]}"; do
         result=$(codeowners --file "${ownersFile}" "$file")