diff --git a/ttynvt.c b/ttynvt.c
index 314b2e3..9814244 100644
--- a/ttynvt.c
+++ b/ttynvt.c
@@ -470,6 +470,8 @@ static void ttynvt_open(fuse_req_t req, struct fuse_file_info *info)
     tty->fds[FD_MASTER].fd = fd;
     tty->fds[FD_MASTER].events = POLLIN;
 
+    memset(&ios, 0, sizeof(ios));
+
     ios.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP
                      | INLCR | IGNCR | ICRNL | IXON);
     ios.c_oflag &= ~OPOST;