diff --git a/migration.c b/migration.c
index 73ce170..bde4956 100644
--- a/migration.c
+++ b/migration.c
@@ -272,7 +272,7 @@ static int migrate_fd_cleanup(MigrationState *s)
         s->file = NULL;
     }

-    migrate_fd_close(s);
+    assert(s->fd == -1);
     return ret;
 }