diff --git a/lib/rubocop/cop/obsession/rails/service_perform_method.rb b/lib/rubocop/cop/obsession/rails/service_perform_method.rb
index d1712bd..949aa5d 100644
--- a/lib/rubocop/cop/obsession/rails/service_perform_method.rb
+++ b/lib/rubocop/cop/obsession/rails/service_perform_method.rb
@@ -46,7 +46,7 @@ def on_class(class_node)
 
             if method.method_name != :perform
               add_offense(method) do |corrector|
-                corrector.replace(method, method.source.sub(/#{method.method_name}/, 'perform'))
+                corrector.replace(method, method.source.sub(method.method_name.to_s, 'perform'))
               end
             end
           end