diff --git a/guix-data-service/jobs/load-new-guix-revision.scm b/guix-data-service/jobs/load-new-guix-revision.scm
index 67023b3..294c830 100644
--- a/guix-data-service/jobs/load-new-guix-revision.scm
+++ b/guix-data-service/jobs/load-new-guix-revision.scm
@@ -517,8 +517,9 @@
            (lambda args
              (simple-format
               (current-error-port)
-              "warning: error when computing ~A derivation for system ~A (~A): ~A\n"
+              "warning: error when computing ~A@~A derivation for system ~A (~A): ~A\n"
               (package-name package)
+              (package-version package)
               system
               (or target "no target")
               args)