diff --git a/guix-data-service/model/derivation.scm b/guix-data-service/model/derivation.scm
index f6a2d0d..801a9b8 100644
--- a/guix-data-service/model/derivation.scm
+++ b/guix-data-service/model/derivation.scm
@@ -1456,18 +1456,6 @@ ON CONFLICT DO NOTHING")))
      query-parts)))
 
 (define (insert-derivation-sources conn derivation-id sources)
-  (define (insert-into-derivation-sources derivation-source-file-ids)
-    (string-append
-     "INSERT INTO derivation_sources "
-     "(derivation_id, derivation_source_file_id) VALUES "
-     (string-join
-      (map (lambda (derivation-source-file-id)
-             (simple-format
-              #f "(~A, ~A)" derivation-id derivation-source-file-id))
-           (vector->list derivation-source-file-ids))
-      ",")
-     "ON CONFLICT DO NOTHING;"))
-
   (let ((sources-ids
          (insert-missing-data-and-return-all-ids
           conn
@@ -1476,8 +1464,19 @@ ON CONFLICT DO NOTHING")))
           (list->vector
            (map list sources)))))
 
-    (exec-query conn
-                (insert-into-derivation-sources sources-ids))
+    (bulk-insert
+     conn
+     "derivation_sources"
+     '(derivation_id derivation_source_file_id)
+     (vector-fold
+      (lambda (_ result derivation-source-file-id)
+        (cons
+         (list derivation-id
+               derivation-source-file-id)
+         result))
+      '()
+      sources-ids)
+     #:returning #f)
 
     sources-ids))