diff --git a/benchmark/irb_exec.yml b/benchmark/irb_exec.yml
index 5575c00537..28933f8b38 100644
--- a/benchmark/irb_exec.yml
+++ b/benchmark/irb_exec.yml
@@ -1,10 +1,10 @@
 prelude: |
   # frozen_string_literal: true
   require 'rbconfig'
-  irb = File.join(File.dirname(RbConfig.ruby), 'irb')
+  irb_f = [File.join(File.dirname(RbConfig.ruby), 'irb'), '-f']
 benchmark:
   irb_exec: |
-    IO.popen(irb, 'w') do |io|
+    IO.popen(irb_f, 'w') do |io|
       io.write('exit')
     end
 loop_count: 30