diff --git a/mutants/mutant-4/swen90006/machine/Machine.java b/mutants/mutant-4/swen90006/machine/Machine.java
index 9bf57316d1c736ea2bd1c62bd6df3c6c0282f331..75a8489dfef51904a2c0b109d17f798eb0c03250 100644
--- a/mutants/mutant-4/swen90006/machine/Machine.java
+++ b/mutants/mutant-4/swen90006/machine/Machine.java
@@ -276,7 +276,7 @@ public class Machine
 	int ra = parseReg(toks[1]);
 	int offs = parseOffset(toks[2]);
 	if (regs[ra] == 0){
-	  pc = pc + offs;
+	  pc = pc - offs;
 	}else{
 	  pc = pc + 1;
 	}