diff --git a/sample/timeout.rb b/sample/timeout.rb
index 3291ae7e80..ad4459aff0 100644
--- a/sample/timeout.rb
+++ b/sample/timeout.rb
@@ -1,7 +1,7 @@
 require 'timeout'
 
 def progress(n = 5)
-  n.times {|i| print i; STDOUT.flush; sleep 1; i+= 1}
+  n.times {|i| print i; STDOUT.flush; sleep 1}
   puts "never reach"
 end