diff --git a/src/include/taler_error_codes.h b/src/include/taler_error_codes.h
index ca7964d47..dbe189936 100644
--- a/src/include/taler_error_codes.h
+++ b/src/include/taler_error_codes.h
@@ -906,6 +906,14 @@ enum TALER_ErrorCode
    */
   TALER_EC_PAY_EXCHANGE_KEYS_FAILURE = 2120,
 
+  /**
+   * The payment is too late, the offer has expired.
+   * This response is
+   * provided with HTTP status code MHD_HTTP_BAD_REQUEST.
+   */
+  TALER_EC_PAY_OFFER_EXPIRED = 2121,
+
+  
   /**
    * Integer overflow with sepcified timestamp argument detected.
    * This response is provided