diff --git a/src/kiss.c b/src/kiss.c
index bdf0e43..2667f1b 100644
--- a/src/kiss.c
+++ b/src/kiss.c
@@ -147,6 +147,8 @@ patty_kiss_tnc *patty_kiss_tnc_new_fd(int fd) {
         if (tcflush(fd, TCIOFLUSH) < 0) {
             goto error_tcflush;
         }
+    } else {
+        errno = 0;
     }
 
     tnc->fd      =  fd;