diff --git a/ref/uxn.c b/ref/uxn.c
index 866b0ee..105a44f 100644
--- a/ref/uxn.c
+++ b/ref/uxn.c
@@ -126,7 +126,7 @@ main(int argc, char **argv)
 	fread(&u.ram[0x0100], 0xff00, 1, f);
 	fclose(f);
 	u.dev[0x17] = argc - i;
-	if(uxn_eval(&u, 0x0100)) {
+	if(uxn_eval(&u, 0x0100) && (u.dev[0x10] << 8 | u.dev[0x11])) {
 		for(; i < argc; i++) {
 			char *p = argv[i];
 			while(*p) console_input(&u, *p++, 0x2);