diff --git a/mutants/mutant-4/swen90006/machine/Machine.java b/mutants/mutant-4/swen90006/machine/Machine.java
index 9bf57316d1c736ea2bd1c62bd6df3c6c0282f331..ec43da69c574ecef7b1bb5994c7fac52d9905525 100644
--- a/mutants/mutant-4/swen90006/machine/Machine.java
+++ b/mutants/mutant-4/swen90006/machine/Machine.java
@@ -198,7 +198,7 @@ public class Machine
       toks = inst.split("\\s+");
 
       /* check minimum number of tokens */
-      if (toks.length < 2){
+      if (toks.length < 1){
 	throw new InvalidInstructionException();
       }