diff --git a/src/types/msg/dex/cancelOrder.ts b/src/types/msg/dex/cancelOrder.ts
index 9bfd52e3..d10026ba 100644
--- a/src/types/msg/dex/cancelOrder.ts
+++ b/src/types/msg/dex/cancelOrder.ts
@@ -19,6 +19,7 @@ export class CancelOrderMsg extends BaseMsg {
   private address: string
   private symbol: string
   private orderId: string
+  public readonly aminoPrefix: AminoPrefix = AminoPrefix.CancelOrderMsg
 
   constructor(address: string, sybmol: string, orderId: string) {
     super()