1 files changed, 9 insertions, 5 deletions
diff --git a/test/psych/test_yamldbm.rb b/test/psych/test_yamldbm.rb
index 165125f65e..c60a18febe 100644
--- a/test/psych/test_yamldbm.rb
+++ b/test/psych/test_yamldbm.rb
@@ -1,10 +1,14 @@
 # -*- coding: UTF-8 -*-
-require 'test/unit'
-require 'yaml/dbm'
-require 'tmpdir'
-Psych::DBM = YAML::DBM unless defined?(Psych::DBM)
+begin
+  require 'test/unit'
+  require 'yaml/dbm'
+  require 'tmpdir'
+rescue LoadError
+end
 
 module Psych
+  ::Psych::DBM = ::YAML::DBM unless defined?(::Psych::DBM)
+
   class YAMLDBMTest < Test::Unit::TestCase
     def setup
       @engine, YAML::ENGINE.yamler = YAML::ENGINE.yamler, 'psych'
@@ -187,4 +191,4 @@ module Psych
       assert_equal([], @yamldbm.select {false})
     end
   end
-end
+end if defined?(YAML::DBM)