1 files changed, 1 insertions, 0 deletions
diff --git a/lib/rubygems.rb b/lib/rubygems.rb
index 1494e915f7..72669fe65b 100644
--- a/lib/rubygems.rb
+++ b/lib/rubygems.rb
@@ -536,6 +536,7 @@ module Gem
 
   def self.load_yaml
     return if @yaml_loaded
+    return unless defined?(gem)
 
     test_syck = ENV['TEST_SYCK']