diff --git a/cache.h b/cache.h
index 1fa2871b43..1064017d13 100644
--- a/cache.h
+++ b/cache.h
@@ -1550,6 +1550,7 @@ struct object_info {
 #define OBJECT_INFO_INIT {NULL}
 
 extern int sha1_object_info_extended(const unsigned char *, struct object_info *, unsigned flags);
+extern int packed_object_info(struct packed_git *pack, off_t offset, struct object_info *);
 
 /* Dumb servers support */
 extern int update_server_info(int);
diff --git a/sha1_file.c b/sha1_file.c
index 090cedb8eb..66edb5efcf 100644
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -1970,8 +1970,8 @@ unwind:
 	goto out;
 }
 
-static int packed_object_info(struct packed_git *p, off_t obj_offset,
-			      struct object_info *oi)
+int packed_object_info(struct packed_git *p, off_t obj_offset,
+		       struct object_info *oi)
 {
 	struct pack_window *w_curs = NULL;
 	unsigned long size;