diff --git a/lib/resolv.rb b/lib/resolv.rb
index f370dba8f0..ae9223e751 100644
--- a/lib/resolv.rb
+++ b/lib/resolv.rb
@@ -2,7 +2,6 @@
 
 require 'socket'
 require 'timeout'
-require 'thread'
 require 'io/wait'
 
 begin