diff --git a/devops-service/db/mongo/models/stack/stack_ec2.rb b/devops-service/db/mongo/models/stack/stack_ec2.rb
index 588a631..184a7fd 100644
--- a/devops-service/db/mongo/models/stack/stack_ec2.rb
+++ b/devops-service/db/mongo/models/stack/stack_ec2.rb
@@ -19,8 +19,8 @@ module Devops
       end
 
       def update_in_cloud!(params)
-        parameters = params.keep_if do |key, value|
-          %w(Parameters TemplateBody TemplateURL Capabilities)
+        parameters = params.keep_if do |key|
+          %w(Parameters TemplateBody TemplateURL Capabilities).include?(key)
         end
 
         provider_instance.update_stack(self, parameters)