1 files changed, 1 insertions, 1 deletions
diff --git a/lib/webrick/utils.rb b/lib/webrick/utils.rb
index 3b250886db..654abb28b1 100644
--- a/lib/webrick/utils.rb
+++ b/lib/webrick/utils.rb
@@ -124,7 +124,7 @@ module WEBrick
           while true
             now = Time.now
             @timeout_info.each{|thread, ary|
-              ary.each{|info|
+              ary.dup.each{|info|
                 time, exception = *info
                 interrupt(thread, info.object_id, exception) if time < now
               }