diff --git a/file.h b/file.h
index 68f9a6e..42fd58c 100644
--- a/file.h
+++ b/file.h
@@ -153,6 +153,7 @@ extern int __must_check file_invalidate_cache(struct thread_data *, struct fio_f
 extern int __must_check generic_open_file(struct thread_data *, struct fio_file *);
 extern int __must_check generic_close_file(struct thread_data *, struct fio_file *);
 extern int __must_check generic_get_file_size(struct thread_data *, struct fio_file *);
+extern int __must_check file_lookup_open(struct fio_file *f, int flags);
 extern int __must_check pre_read_files(struct thread_data *);
 extern int add_file(struct thread_data *, const char *);
 extern int add_file_exclusive(struct thread_data *, const char *);
diff --git a/filesetup.c b/filesetup.c
index 64da8bb..06b7d7f 100644
--- a/filesetup.c
+++ b/filesetup.c
@@ -435,7 +435,7 @@ int generic_close_file(struct thread_data fio_unused *td, struct fio_file *f)
 	return ret;
 }
 
-static int file_lookup_open(struct fio_file *f, int flags)
+int file_lookup_open(struct fio_file *f, int flags)
 {
 	struct fio_file *__f;
 	int from_hash;