diff --git a/se/sics/mspsim/core/MSP430Constants.java b/se/sics/mspsim/core/MSP430Constants.java
index a339222..911ba18 100644
--- a/se/sics/mspsim/core/MSP430Constants.java
+++ b/se/sics/mspsim/core/MSP430Constants.java
@@ -181,7 +181,7 @@ public interface MSP430Constants {
   public static final int CG2 = 3;
 
   public static final int[][] CREG_VALUES = new int[][]{
-    {0, 0, 4, 8}, {0, 1, 2, 0xffff}
+    {0, 0, 4, 8}, {0, 1, 2, 0xfffff}
   };
 
   public static final int CARRY_B = 0;