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-rw-r--r--lib/tdb/mt.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/tdb/mt.rb b/lib/tdb/mt.rb
index 4cea5f5..1bdbf3d 100644
--- a/lib/tdb/mt.rb
+++ b/lib/tdb/mt.rb
@@ -1,6 +1,7 @@
 # -*- encoding: binary -*-
 
 # WARNING: this is not recommended, it is still possible to break this
+require 'thread'
 module TDB::MT
   def initialize
     super