diff --git a/lib/jsonapi/request_parser.rb b/lib/jsonapi/request_parser.rb
index 14d2ca487..8d75ed6c2 100644
--- a/lib/jsonapi/request_parser.rb
+++ b/lib/jsonapi/request_parser.rb
@@ -152,7 +152,7 @@ def setup_show_relationship_action(params, resource_klass)
           resource_klass,
           context: @context,
           relationship_type: relationship_type,
-          parent_key: resource_klass.verify_key(parent_key)
+          parent_key: resource_klass.verify_key(parent_key, @context)
       )
     end
 
diff --git a/lib/jsonapi/routing_ext.rb b/lib/jsonapi/routing_ext.rb
index 045090cc4..3738280f9 100644
--- a/lib/jsonapi/routing_ext.rb
+++ b/lib/jsonapi/routing_ext.rb
@@ -21,7 +21,7 @@ def jsonapi_resource(*resources, &_block)
           res = JSONAPI::Resource.resource_klass_for(resource_type_with_module_prefix(@resource_type))
 
           options = resources.extract_options!.dup
-          options[:controller] ||= @resource_type
+          options[:controller] ||= @resource_type.pluralize
           options.merge!(res.routing_resource_options)
           options[:path] = format_route(@resource_type)