diff --git a/lib/sidekiq/cli.rb b/lib/sidekiq/cli.rb
index cbf516a4..c4b70866 100644
--- a/lib/sidekiq/cli.rb
+++ b/lib/sidekiq/cli.rb
@@ -64,7 +64,7 @@ module Sidekiq
       sigs.each do |sig|
         begin
           trap sig do
-            self_write.puts(sig)
+            self_write.write("#{sig}\n")
           end
         rescue ArgumentError
           puts "Signal #{sig} not supported"