diff --git a/lib/rubocop/cop/rspec/file_path.rb b/lib/rubocop/cop/rspec/file_path.rb
index ed4fbf444..aa1c19bb6 100644
--- a/lib/rubocop/cop/rspec/file_path.rb
+++ b/lib/rubocop/cop/rspec/file_path.rb
@@ -165,7 +165,7 @@ def routing_spec_path?
         end
 
         def expanded_file_path
-          File.expand_path(processed_source.buffer.name)
+          File.expand_path(processed_source.file_path)
         end
       end
     end