diff --git a/bundle.c b/bundle.c
index 9370a6e307..56681c2113 100644
--- a/bundle.c
+++ b/bundle.c
@@ -620,6 +620,10 @@ int unbundle(struct repository *r, struct bundle_header *header,
 	struct child_process ip = CHILD_PROCESS_INIT;
 	strvec_pushl(&ip.args, "index-pack", "--fix-thin", "--stdin", NULL);
 
+	/* If there is a filter, then we need to create the promisor pack. */
+	if (header->filter.choice)
+		strvec_push(&ip.args, "--promisor=from-bundle");
+
 	if (extra_index_pack_args) {
 		strvec_pushv(&ip.args, extra_index_pack_args->v);
 		strvec_clear(extra_index_pack_args);
diff --git a/t/t6020-bundle-misc.sh b/t/t6020-bundle-misc.sh
index 6e97c044ee..7c6db67022 100755
--- a/t/t6020-bundle-misc.sh
+++ b/t/t6020-bundle-misc.sh
@@ -521,6 +521,8 @@ do
 
 		git init unbundled &&
 		git -C unbundled bundle unbundle ../partial.bdl >ref-list.txt &&
+		ls unbundled/.git/objects/pack/pack-*.promisor >promisor &&
+		test_line_count = 1 promisor &&
 
 		# Count the same number of reachable objects.
 		reflist=$(git for-each-ref --format="%(objectname)") &&