diff --git a/sketches/simulator-sketch-v3.js b/sketches/simulator-sketch-v3.js
index df7edcd..3f8bb9c 100644
--- a/sketches/simulator-sketch-v3.js
+++ b/sketches/simulator-sketch-v3.js
@@ -4,7 +4,7 @@
 //   one byte for the opcode, one for the argument
 
 const INITIAL_IP_ADDRESS = 32;
-const CYCLE_LIMIT = 64; // max number of times to step the CPU, to stop endless loops
+const CYCLE_LIMIT = 128; // max number of times to step the CPU, to stop endless loops
 
 const display = require('./display.js');