diff --git a/test/ruby/lbtest.rb b/test/ruby/lbtest.rb
index df7872dc76..8da247b7b4 100644
--- a/test/ruby/lbtest.rb
+++ b/test/ruby/lbtest.rb
@@ -36,13 +36,13 @@ lb = LocalBarrier.new(n)
 (n - 1).times do |i|
   Thread.start do
     sleep((rand(n) + 1) / 10.0)
-    puts "#{i}: done"
+    print "#{i}: done\n"
     lb.sync
-    puts "#{i}: cont"
+    print "#{i}: cont\n"
   end
 end
 
 lb.sync
-puts "#{n-1}: cone"
+print "#{n-1}: cone\n"
 
-puts "exit."
+print "exit.\n"