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-rw-r--r--lib/drb/drb.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/drb/drb.rb b/lib/drb/drb.rb
index c90ff8e169..15eba3f4f1 100644
--- a/lib/drb/drb.rb
+++ b/lib/drb/drb.rb
@@ -48,6 +48,7 @@
require 'socket'
require 'io/wait'
+require 'monitor'
require_relative 'eq'
#