diff --git a/src/contracts/JavaCommercialPaper.java b/src/contracts/JavaCommercialPaper.java
index 1655af6042..0aa283789e 100644
--- a/src/contracts/JavaCommercialPaper.java
+++ b/src/contracts/JavaCommercialPaper.java
@@ -50,14 +50,14 @@ public class JavaCommercialPaper implements Contract {
     }
 
     public static class Commands implements core.Command {
-        public static class Move {
+        public static class Move extends Commands {
             @Override
             public boolean equals(Object obj) {
                 return obj instanceof Move;
             }
         }
 
-        public static class Redeem {
+        public static class Redeem extends Commands {
             @Override
             public boolean equals(Object obj) {
                 return obj instanceof Redeem;