diff --git a/block/vvfat.c b/block/vvfat.c
index e1fcdbc45bfd2926a2beefafdf9008d03a044979..75d0dc07e0d1bc120e72108854b60133de1c7da8 100644
--- a/block/vvfat.c
+++ b/block/vvfat.c
@@ -799,6 +799,7 @@ static int read_directory(BDRVVVFATState* s, int mapping_index)
 	/* root directory */
 	int cur = s->directory.next;
 	array_ensure_allocated(&(s->directory), ROOT_ENTRIES - 1);
+	s->directory.next = ROOT_ENTRIES;
 	memset(array_get(&(s->directory), cur), 0,
 		(ROOT_ENTRIES - cur) * sizeof(direntry_t));
     }