diff --git a/lib/logstash/inputs/tcp.rb b/lib/logstash/inputs/tcp.rb
index d6b458f70..ed8d3d7f7 100644
--- a/lib/logstash/inputs/tcp.rb
+++ b/lib/logstash/inputs/tcp.rb
@@ -1,9 +1,6 @@
 require "logstash/inputs/base"
 require "logstash/namespace"
 require "logstash/util/socket_peer"
-require "socket"
-require "timeout"
-require "openssl"
 
 # Read events over a TCP socket.
 #
@@ -60,7 +57,10 @@ class LogStash::Inputs::Tcp < LogStash::Inputs::Base
 
   public
   def register
+    require "socket"
+    require "timeout"
     if @ssl_enable
+      require "openssl"
       @ssl_context = OpenSSL::SSL::SSLContext.new
       @ssl_context.cert = OpenSSL::X509::Certificate.new(File.read(@ssl_cert))
       @ssl_context.key = OpenSSL::PKey::RSA.new(File.read(@ssl_key),@ssl_key_passphrase)