diff --git a/eo/src/es/eoRealOp.h b/eo/src/es/eoRealOp.h
index 7faef3dc..c2eae2f1 100644
--- a/eo/src/es/eoRealOp.h
+++ b/eo/src/es/eoRealOp.h
@@ -101,7 +101,7 @@ template<class EOT> class eoUniformMutation: public eoMonOp<EOT>
 	  {
 	    if (rng.flip(p_change[0]))
 	      {
-		_eo[0] += 2*epsilon[0]*rng.uniform()-epsilon[0];
+		_eo[lieu] += 2*epsilon[0]*rng.uniform()-epsilon[0];
 		hasChanged = true;
 	      }
 	  }