diff --git a/mutants/mutant-1/swen90006/machine/Machine.java b/mutants/mutant-1/swen90006/machine/Machine.java
index 2c2c13c0855d6c8212198d4085c069064fe83f8a..724f498c30b6b8a4181bdf05354ffad40ec73f1a 100644
--- a/mutants/mutant-1/swen90006/machine/Machine.java
+++ b/mutants/mutant-1/swen90006/machine/Machine.java
@@ -81,7 +81,7 @@ public class Machine
   }
 
   private void do_load(int dest, int src, int offs) {
-    if (regs[src] + offs > MAX_ADDR){
+    if (regs[src] + offs >= MAX_ADDR){
       /* no op */
     }else if(regs[src] + offs < 0){
       /* no op */
@@ -148,7 +148,7 @@ public class Machine
   private void validate_offset(int offset)
     throws InvalidInstructionException
   {
-    if (offset < -MAX_ADDR || offset > MAX_ADDR+1) {
+    if (offset < -MAX_ADDR || offset > MAX_ADDR) {
       throw new InvalidInstructionException();
     }
   }