diff --git a/mutants/mutant-1/swen90006/machine/Machine.java b/mutants/mutant-1/swen90006/machine/Machine.java
index b550ba429a0957a1a901809d221f87afd0259d8d..fed505831b861881eadee2a8329660a38e4fb127 100644
--- a/mutants/mutant-1/swen90006/machine/Machine.java
+++ b/mutants/mutant-1/swen90006/machine/Machine.java
@@ -96,7 +96,7 @@ public class Machine
     }else if(regs[a] + offs < 0){
       /* no op */
     }else{
-      memory[regs[a] + offs] = regs[b]-1;
+      memory[regs[a] + offs - 1] = regs[b];
     }
   }