diff --git a/src/devices/system.c b/src/devices/system.c
index e44dc5f..7f638d7 100644
--- a/src/devices/system.c
+++ b/src/devices/system.c
@@ -17,8 +17,7 @@ WITH REGARD TO THIS SOFTWARE.
 static const char *errors[] = {
 	"underflow",
 	"overflow",
-	"division by zero",
-	"busy"
+	"division by zero"
 };
 
 static void
diff --git a/src/uxn.c b/src/uxn.c
index 8c1ea8c..6aaa73a 100644
--- a/src/uxn.c
+++ b/src/uxn.c
@@ -88,7 +88,7 @@ uxn_eval(Uxn *u, Uint16 pc)
 		case 0x1f: /* SFT */ POP8(a) POP(b) PUSH(src, b >> (a & 0x0f) << ((a & 0xf0) >> 4)) break;
 		}
 	}
-	return (u->wst->ptr || u->rst->ptr) ? uxn_halt(u, instr, 4, pc - 1) : 1;
+	return 1;
 err:
 	return uxn_halt(u, instr, errcode, pc - 1);
 }