diff --git a/guix-data-service/jobs/load-new-guix-revision.scm b/guix-data-service/jobs/load-new-guix-revision.scm
index a925ee2..ef07797 100644
--- a/guix-data-service/jobs/load-new-guix-revision.scm
+++ b/guix-data-service/jobs/load-new-guix-revision.scm
@@ -1938,7 +1938,7 @@ SELECT 1 FROM derivation_source_file_nars WHERE derivation_source_file_id = $1"
 
          (inferior-eval '(vector-length gds-inferior-packages) inferior))))
 
-    (define chunk-size 3000)
+    (define chunk-size 1000)
 
     (define (process-system-and-target system target)
       (with-time-logging