diff --git a/bulk-checkin.c b/bulk-checkin.c
index 39ee7d6107..583aacb9e3 100644
--- a/bulk-checkin.c
+++ b/bulk-checkin.c
@@ -197,7 +197,7 @@ static int deflate_to_pack(struct bulk_checkin_state *state,
 	git_hash_ctx ctx;
 	unsigned char obuf[16384];
 	unsigned header_len;
-	struct hashfile_checkpoint checkpoint;
+	struct hashfile_checkpoint checkpoint = {0};
 	struct pack_idx_entry *idx = NULL;
 
 	seekback = lseek(fd, 0, SEEK_CUR);