diff --git a/homeassistant/helpers/config_validation.py b/homeassistant/helpers/config_validation.py
index f8d69a6e49a..de9fa2a4169 100644
--- a/homeassistant/helpers/config_validation.py
+++ b/homeassistant/helpers/config_validation.py
@@ -1307,6 +1307,7 @@ currency = vol.In(
         "BSD",
         "BTN",
         "BWP",
+        "BYN",
         "BYR",
         "BZD",
         "CAD",