diff --git a/helper/schema/schema.go b/helper/schema/schema.go
index 73ecd66d5..089e6b213 100644
--- a/helper/schema/schema.go
+++ b/helper/schema/schema.go
@@ -762,7 +762,7 @@ func (m schemaMap) internalValidate(topSchemaMap schemaMap, attrsOnly bool) erro
 
 					var ok bool
 					if target, ok = sm[part]; !ok {
-						return fmt.Errorf("%s: ConflictsWith references unknown attribute (%s)", k, key)
+						return fmt.Errorf("%s: ConflictsWith references unknown attribute (%s) at part (%s)", k, key, part)
 					}
 
 					if subResource, ok := target.Elem.(*Resource); ok {