diff --git a/mutants/mutant-2/swen90006/machine/Machine.java b/mutants/mutant-2/swen90006/machine/Machine.java
index 9bf57316d1c736ea2bd1c62bd6df3c6c0282f331..cd0dcdfb22f1b0e23837d90d1437ad35ed7d1d04 100644
--- a/mutants/mutant-2/swen90006/machine/Machine.java
+++ b/mutants/mutant-2/swen90006/machine/Machine.java
@@ -106,7 +106,7 @@ public class Machine
 
   private int parseReg(String s) throws InvalidInstructionException
   {
-    if (s.length() < 2){
+    if (s.length() < 3){
       throw new InvalidInstructionException();
     }
     if (s.charAt(0) != 'r'){