diff --git a/src/kiss.c b/src/kiss.c
index a3945bb..64d44c9 100644
--- a/src/kiss.c
+++ b/src/kiss.c
@@ -52,7 +52,7 @@ patty_kiss_tnc *patty_kiss_tnc_new_fd(int fd) {
         goto error_malloc_buf;
     }
 
-    if (isatty(fd)) {
+    if (isatty(fd) && ptsname(fd) == NULL) {
         if (tcgetattr(fd, &tnc->attrs) < 0) {
             goto error_tcgetattr;
         }