diff --git a/acyclic-visitor/src/main/java/com/iluwatar/acyclicvisitor/HayesVisitor.java b/acyclic-visitor/src/main/java/com/iluwatar/acyclicvisitor/HayesVisitor.java
index 90e8a2a1b..1731622f2 100644
--- a/acyclic-visitor/src/main/java/com/iluwatar/acyclicvisitor/HayesVisitor.java
+++ b/acyclic-visitor/src/main/java/com/iluwatar/acyclicvisitor/HayesVisitor.java
@@ -25,6 +25,6 @@ package com.iluwatar.acyclicvisitor;
 /**
  * HayesVisitor interface
  */
-public interface HayesVisitor {
+public interface HayesVisitor extends ModemVisitor {
   void visit(Hayes hayes);
 }
diff --git a/acyclic-visitor/src/main/java/com/iluwatar/acyclicvisitor/ZoomVisitor.java b/acyclic-visitor/src/main/java/com/iluwatar/acyclicvisitor/ZoomVisitor.java
index 85646921c..b4c949ed7 100644
--- a/acyclic-visitor/src/main/java/com/iluwatar/acyclicvisitor/ZoomVisitor.java
+++ b/acyclic-visitor/src/main/java/com/iluwatar/acyclicvisitor/ZoomVisitor.java
@@ -25,6 +25,6 @@ package com.iluwatar.acyclicvisitor;
 /**
  * ZoomVisitor interface
  */
-public interface ZoomVisitor {
+public interface ZoomVisitor extends ModemVisitor{
   void visit(Zoom zoom);
 }