diff --git a/src/ttynvt.c b/src/ttynvt.c
index b7320cc..d7abe43 100644
--- a/src/ttynvt.c
+++ b/src/ttynvt.c
@@ -541,6 +541,7 @@ static void ttynvt_open(fuse_req_t req, struct fuse_file_info *info)
 
     free(tty_cli);
     _ttynvt_ctx_destroy(tty);
+    ptty = NULL;
 
     fuse_reply_err(req, errno);