diff --git a/lib/yaml/dbm.rb b/lib/yaml/dbm.rb
index 126d72dd4d..a3cbaeccf6 100644
--- a/lib/yaml/dbm.rb
+++ b/lib/yaml/dbm.rb
@@ -1,6 +1,10 @@
 # frozen_string_literal: false
 require 'yaml'
-require 'dbm'
+
+begin
+  require 'dbm'
+rescue LoadError
+end
 
 module YAML
 
@@ -288,4 +292,4 @@ class DBM < ::DBM
     alias :each :each_pair
 end
 
-end
+end if defined?(DBM)
diff --git a/test/yaml/test_dbm.rb b/test/yaml/test_dbm.rb
index 15d441d23b..cf50256298 100644
--- a/test/yaml/test_dbm.rb
+++ b/test/yaml/test_dbm.rb
@@ -43,4 +43,4 @@ class TestYAMLDBM < Test::Unit::TestCase
     @dbm["key"] = "value"
     assert_equal ["key", "value"], @dbm.shift
   end
-end
\ No newline at end of file
+end if defined?(YAML::DBM)