diff --git a/spec/jwt/kms_spec.rb b/spec/jwt/kms_spec.rb
index f3cb059..3b8b81c 100644
--- a/spec/jwt/kms_spec.rb
+++ b/spec/jwt/kms_spec.rb
@@ -6,7 +6,7 @@
   end
 
   let(:algo_instance) do
-    described_class.by(key_id: key_id)
+    described_class::Key.by(key_id: key_id)
   end
 
   let(:payload) { { "pay" => "load" } }