diff --git a/src/main/java/icu/samnyan/aqua/sega/billing/BillingController.java b/src/main/java/icu/samnyan/aqua/sega/billing/BillingController.java
index 048e46b7..6c156e5b 100644
--- a/src/main/java/icu/samnyan/aqua/sega/billing/BillingController.java
+++ b/src/main/java/icu/samnyan/aqua/sega/billing/BillingController.java
@@ -73,7 +73,7 @@ public class BillingController {
         ByteBuffer sigbytes = ByteBuffer.allocate(15);
         sigbytes.order(ByteOrder.LITTLE_ENDIAN);
         sigbytes.putInt(0, val);
-        sigbytes.put(4, keychipId.getBytes());
+        sigbytes.put(4, keychipId.getBytes(), 0, keychipId.getBytes().length);
 
         Signature sig;
         try {