diff --git a/packfile-list.c b/packfile-list.c
index 01fb913abf78fc..d6d411823c34a9 100644
--- a/packfile-list.c
+++ b/packfile-list.c
@@ -57,11 +57,12 @@ void packfile_list_prepend(struct packfile_list *list, struct packed_git *pack)
 		list->tail = entry;
 }
 
-void packfile_list_append(struct packfile_list *list, struct packed_git *pack)
+void packfile_list_append(struct packfile_list *list, struct packed_git *pack,
+			  int skip_dup_check)
 {
 	struct packfile_list_entry *entry;
 
-	entry = packfile_list_remove_internal(list, pack);
+	entry = skip_dup_check ? NULL : packfile_list_remove_internal(list, pack);
 	if (!entry) {
 		entry = xmalloc(sizeof(*entry));
 		entry->pack = pack;
diff --git a/packfile-list.h b/packfile-list.h
index 1b05e2aa36de08..2b4b98b22673a4 100644
--- a/packfile-list.h
+++ b/packfile-list.h
@@ -15,7 +15,8 @@ struct packfile_list_entry {
 void packfile_list_clear(struct packfile_list *list);
 void packfile_list_remove(struct packfile_list *list, struct packed_git *pack);
 void packfile_list_prepend(struct packfile_list *list, struct packed_git *pack);
-void packfile_list_append(struct packfile_list *list, struct packed_git *pack);
+void packfile_list_append(struct packfile_list *list, struct packed_git *pack,
+			  int skip_dup_check);
 
 /*
  * Find the pack within the "packs" list whose index contains the object
diff --git a/packfile.c b/packfile.c
index 0eee45055f833e..f80f05a1fec8ea 100644
--- a/packfile.c
+++ b/packfile.c
@@ -781,7 +781,7 @@ void packfile_store_add_pack(struct odb_source_packed *store,
 	if (pack->pack_fd != -1)
 		pack_open_fds++;
 
-	packfile_list_append(&store->packs, pack);
+	packfile_list_append(&store->packs, pack, 1);
 	strmap_put(&store->packs_by_path, pack->pack_name, pack);
 }
 
diff --git a/t/perf/p5303-many-packs.sh b/t/perf/p5303-many-packs.sh
index af173a7b73e398..4221f9dd706243 100755
--- a/t/perf/p5303-many-packs.sh
+++ b/t/perf/p5303-many-packs.sh
@@ -141,4 +141,8 @@ test_perf "load 10,000 packs" '
 	git rev-parse --verify "HEAD^{commit}"
 '
 
+test_perf "abbreviate with 10,000 packs" '
+	git rev-parse --short HEAD
+'
+
 test_done