diff --git a/xtrn/sdk/xsdkwrap.c b/xtrn/sdk/xsdkwrap.c
index 2d24ea635caa907d2d7e3d72d1d26bd3628fe7e7..93b235f974d8021d015c685cee38f4cbe0a9cca8 100644
--- a/xtrn/sdk/xsdkwrap.c
+++ b/xtrn/sdk/xsdkwrap.c
@@ -230,7 +230,7 @@ void _termios_setup(void)
 
 int kbhit(void)
 {
-	if(!isatty(fileno(stdin)))
+	if(!isatty(0))
 		return(0);
 
 	// set up select() args