diff --git a/aries_cloudagent/messaging/valid.py b/aries_cloudagent/messaging/valid.py
index 73e66af0d0..e2e47eb6cf 100644
--- a/aries_cloudagent/messaging/valid.py
+++ b/aries_cloudagent/messaging/valid.py
@@ -750,10 +750,10 @@ def __call__(self, value):
             if "id" in subject:
                 uri_validator = Uri()
                 try:
-                    uri_validator(value["id"])
+                    uri_validator(subject["id"])
                 except ValidationError:
                     raise ValidationError(
-                        f"credential subject id {value[0]} must be URI"
+                        f'credential subject id {subject["id"]} must be URI'
                     ) from None
 
         return value