diff --git a/patterns/chain/ChainOfResponsibility.java b/patterns/chain/ChainOfResponsibility.java
index b291c3e00..20820bb5a 100644
--- a/patterns/chain/ChainOfResponsibility.java
+++ b/patterns/chain/ChainOfResponsibility.java
@@ -7,10 +7,6 @@
 import java.util.*;
 import java.util.function.*;
 
-interface Algorithm {
-  Result algorithm(List<Double> line);
-}
-
 class FindMinima {
   public static Result test(
     boolean success, String id, double d1, double d2) {