diff --git a/builtin/fast-import.c b/builtin/fast-import.c
index ffee7d3abd..f4892d7f37 100644
--- a/builtin/fast-import.c
+++ b/builtin/fast-import.c
@@ -806,7 +806,7 @@ static char *keep_pack(const char *curr_index_name)
 	struct strbuf name = STRBUF_INIT;
 	int keep_fd;
 
-	odb_pack_name(&name, pack_data->hash, "keep");
+	odb_pack_name(the_repository, &name, pack_data->hash, "keep");
 	keep_fd = odb_pack_keep(name.buf);
 	if (keep_fd < 0)
 		die_errno("cannot create keep file");
@@ -814,11 +814,11 @@ static char *keep_pack(const char *curr_index_name)
 	if (close(keep_fd))
 		die_errno("failed to write keep file");
 
-	odb_pack_name(&name, pack_data->hash, "pack");
+	odb_pack_name(the_repository, &name, pack_data->hash, "pack");
 	if (finalize_object_file(pack_data->pack_name, name.buf))
 		die("cannot store pack file");
 
-	odb_pack_name(&name, pack_data->hash, "idx");
+	odb_pack_name(the_repository, &name, pack_data->hash, "idx");
 	if (finalize_object_file(curr_index_name, name.buf))
 		die("cannot store index file");
 	free((void *)curr_index_name);
@@ -832,7 +832,7 @@ static void unkeep_all_packs(void)
 
 	for (k = 0; k < pack_id; k++) {
 		struct packed_git *p = all_packs[k];
-		odb_pack_name(&name, p->hash, "keep");
+		odb_pack_name(p->repo, &name, p->hash, "keep");
 		unlink_or_warn(name.buf);
 	}
 	strbuf_release(&name);
diff --git a/builtin/index-pack.c b/builtin/index-pack.c
index be2f99625e..eaefb41761 100644
--- a/builtin/index-pack.c
+++ b/builtin/index-pack.c
@@ -1479,7 +1479,7 @@ static void write_special_file(const char *suffix, const char *msg,
 	if (pack_name)
 		filename = derive_filename(pack_name, "pack", suffix, &name_buf);
 	else
-		filename = odb_pack_name(&name_buf, hash, suffix);
+		filename = odb_pack_name(the_repository, &name_buf, hash, suffix);
 
 	fd = odb_pack_keep(filename);
 	if (fd < 0) {
@@ -1507,7 +1507,7 @@ static void rename_tmp_packfile(const char **final_name,
 {
 	if (!*final_name || strcmp(*final_name, curr_name)) {
 		if (!*final_name)
-			*final_name = odb_pack_name(name, hash, ext);
+			*final_name = odb_pack_name(the_repository, name, hash, ext);
 		if (finalize_object_file(curr_name, *final_name))
 			die(_("unable to rename temporary '*.%s' file to '%s'"),
 			    ext, *final_name);
diff --git a/builtin/pack-redundant.c b/builtin/pack-redundant.c
index d2c1c4e5ec..7d6c47ffd9 100644
--- a/builtin/pack-redundant.c
+++ b/builtin/pack-redundant.c
@@ -589,7 +589,7 @@ static void load_all(void)
 	}
 }
 
-int cmd_pack_redundant(int argc, const char **argv, const char *prefix UNUSED, struct repository *repo UNUSED) {
+int cmd_pack_redundant(int argc, const char **argv, const char *prefix UNUSED, struct repository *repo) {
 	int i; int i_still_use_this = 0; struct pack_list *min = NULL, *red, *pl;
 	struct llist *ignore;
 	struct strbuf idx_name = STRBUF_INIT;
@@ -690,7 +690,7 @@ int cmd_pack_redundant(int argc, const char **argv, const char *prefix UNUSED, s
 	pl = red = pack_list_difference(local_packs, min);
 	while (pl) {
 		printf("%s\n%s\n",
-		       odb_pack_name(&idx_name, pl->pack->hash, "idx"),
+		       odb_pack_name(repo, &idx_name, pl->pack->hash, "idx"),
 		       pl->pack->pack_name);
 		pl = pl->next;
 	}
diff --git a/http.c b/http.c
index 7e5be05207..50d8811cea 100644
--- a/http.c
+++ b/http.c
@@ -2579,7 +2579,7 @@ struct http_pack_request *new_direct_http_pack_request(
 
 	preq->url = url;
 
-	odb_pack_name(&preq->tmpfile, packed_git_hash, "pack");
+	odb_pack_name(the_repository, &preq->tmpfile, packed_git_hash, "pack");
 	strbuf_addstr(&preq->tmpfile, ".temp");
 	preq->packfile = fopen(preq->tmpfile.buf, "a");
 	if (!preq->packfile) {
diff --git a/packfile.c b/packfile.c
index cc558f06cc..096a0cd6ba 100644
--- a/packfile.c
+++ b/packfile.c
@@ -25,13 +25,12 @@
 #include "pack-revindex.h"
 #include "promisor-remote.h"
 
-char *odb_pack_name(struct strbuf *buf,
-		    const unsigned char *hash,
-		    const char *ext)
+char *odb_pack_name(struct repository *repo, struct strbuf *buf,
+		    const unsigned char *hash, const char *ext)
 {
 	strbuf_reset(buf);
-	strbuf_addf(buf, "%s/pack/pack-%s.%s", repo_get_object_directory(the_repository),
-		    hash_to_hex(hash), ext);
+	strbuf_addf(buf, "%s/pack/pack-%s.%s", repo_get_object_directory(repo),
+		    hash_to_hex_algop(hash, repo->hash_algo), ext);
 	return buf->buf;
 }
 
diff --git a/packfile.h b/packfile.h
index 344da905c2..48d058699d 100644
--- a/packfile.h
+++ b/packfile.h
@@ -29,7 +29,8 @@ struct pack_entry {
  *
  * Example: odb_pack_name(out, sha1, "idx") => ".git/objects/pack/pack-1234..idx"
  */
-char *odb_pack_name(struct strbuf *buf, const unsigned char *sha1, const char *ext);
+char *odb_pack_name(struct repository *repo, struct strbuf *buf,
+		    const unsigned char *hash, const char *ext);
 
 /*
  * Return the basename of the packfile, omitting any containing directory
