diff --git a/lib/coral_core.rb b/lib/coral_core.rb
index <HASH>..<HASH> 100644
--- a/lib/coral_core.rb
+++ b/lib/coral_core.rb
@@ -91,6 +91,7 @@ require 'multi_json'
 require 'digest/sha1'
 require 'optparse'
 require 'thread'
+require 'tmpdir'
 
 #---
Adding a require of the tmpdir gem in the coral loader.