diff --git a/ot_stats.h b/ot_stats.h
index 4c59f8b..c73ebec 100644
--- a/ot_stats.h
+++ b/ot_stats.h
@@ -30,6 +30,7 @@ enum {
   CODE_HTTPERROR_400_PARAM,
   CODE_HTTPERROR_400_COMPACT,
   CODE_HTTPERROR_402_NOTMODEST,
+  CODE_HTTPERROR_402_PAYMENT_REQUIRED,
   CODE_HTTPERROR_403_IP,
   CODE_HTTPERROR_404,
   CODE_HTTPERROR_500,