diff --git a/homeassistant/helpers/config_validation.py b/homeassistant/helpers/config_validation.py
index 48f26c2b768..6963b2cfb05 100644
--- a/homeassistant/helpers/config_validation.py
+++ b/homeassistant/helpers/config_validation.py
@@ -914,9 +914,9 @@ def key_value_schemas(
             with contextlib.suppress(vol.Invalid):
                 return cast(dict[Hashable, Any], default_schema(value))
 
-        alternatives = ", ".join(str(key) for key in value_schemas)
+        alternatives = ", ".join(str(alternative) for alternative in value_schemas)
         if default_description:
-            alternatives += ", " + default_description
+            alternatives = f"{alternatives}, {default_description}"
         raise vol.Invalid(
             f"Unexpected value for {key}: '{key_value}'. Expected {alternatives}"
         )