diff --git a/errors/v1/msg.proto b/errors/v1/msg.proto
index 98bbf62..2f69a24 100644
--- a/errors/v1/msg.proto
+++ b/errors/v1/msg.proto
@@ -34,6 +34,7 @@ enum ErrCode {
   INVALID_ARGUMENT_UNKNOWN_TYPE = 2012;
   INVALID_ARGUMENT_BAD_STELLAR_ADDRESS = 2013;
   INVALID_ARGUMENT_ZERO_AMOUNT = 2014;
+  INVALID_BUY_AMOUNT = 2015;
 
   // Resource errors
   NOT_FOUND = 3000;