diff --git a/tasks/benchmark.rb b/tasks/benchmark.rb
index 930d9087cf..5eb3ead9a3 100644
--- a/tasks/benchmark.rb
+++ b/tasks/benchmark.rb
@@ -17,7 +17,7 @@
 
       loop do
         f.puts data
-        break if File.size(BENCHMARK_FILE_PATH) > BENCHMARK_FILE_SIZE
+        break if f.size > BENCHMARK_FILE_SIZE
       end
     end
   end