diff --git a/src/main/java/it/pierfani/smsapi/dto/CodeSendingRequest.java b/src/main/java/it/pierfani/smsapi/dto/CodeSendingRequest.java
index 3bc7ca8..6176f43 100644
--- a/src/main/java/it/pierfani/smsapi/dto/CodeSendingRequest.java
+++ b/src/main/java/it/pierfani/smsapi/dto/CodeSendingRequest.java
@@ -7,5 +7,5 @@ public class CodeSendingRequest {
     private String phoneNumber;
     private String from;
     private String content;
-    private boolean fast = true;
+    private String fast;
 }
\ No newline at end of file