diff --git a/lib/dm-core.rb b/lib/dm-core.rb
index <HASH>..<HASH> 100644
--- a/lib/dm-core.rb
+++ b/lib/dm-core.rb
@@ -26,7 +26,7 @@ require 'extlib/inflection'
 begin
   gem 'fastthread', '~>1.0.1'
   require 'fastthread'
-rescue Gem::LoadError
+rescue LoadError
   # fastthread not installed
 end
Changed exception to check for to ancestor of Gem::LoadError