diff --git a/lib/fluent/config/literal_parser.rb b/lib/fluent/config/literal_parser.rb
index 3af66d54c3..b2468a3f10 100644
--- a/lib/fluent/config/literal_parser.rb
+++ b/lib/fluent/config/literal_parser.rb
@@ -18,6 +18,7 @@
 
 require 'json'
 require 'yajl'
+require 'socket'
 require 'irb/ruby-lex'  # RubyLex
 
 require 'fluent/config/basic_parser'
@@ -162,6 +163,11 @@ def eval_embedded_code(code)
         if @eval_context.nil?
           parse_error! "embedded code is not allowed in this file"
         end
+        # Add hostname and worker_id to code for preventing unused warnings
+        code = <<EOM + code
+hostname = Socket.gethostname
+worker_id = ENV['SERVERENGINE_WORKER_ID'] || ''
+EOM
         @eval_context.instance_eval(code)
       end
 
diff --git a/test/command/test_fluentd.rb b/test/command/test_fluentd.rb
index f47fdfdc3b..2fcbd4f86c 100644
--- a/test/command/test_fluentd.rb
+++ b/test/command/test_fluentd.rb
@@ -494,14 +494,14 @@ def assert_fluentd_fails_to_start(cmdline, *pattern_list, timeout: 10)
     end
 
     test 'success to start the number of workers specified in configuration' do
-      conf = <<CONF
+      conf = <<'CONF'
 <system>
   workers 2
   root_dir #{@root_path}
 </system>
 <source>
   @type dummy
-  @id dummy
+  @id "dummy#{worker_id}" # check worker_id works or not with actual command
   @label @dummydata
   tag dummy
   dummy {"message": "yay!"}
diff --git a/test/config/test_literal_parser.rb b/test/config/test_literal_parser.rb
index ae8d0e9cf1..212d470377 100644
--- a/test/config/test_literal_parser.rb
+++ b/test/config/test_literal_parser.rb
@@ -232,6 +232,14 @@ def test_falseX
       test("\"\#{\n=begin\n}\"") { assert_parse_error("\"\#{\n=begin\n}\"") }  # error in embedded ruby code
       test('"#{v1}foo#{v2}"') { assert_text_parsed_as("#{v1}foo#{v2}", '"#{v1}foo#{v2}"') }
       test('"#{1+1}foo#{2+2}bar"') { assert_text_parsed_as("#{1+1}foo#{2+2}bar", '"#{1+1}foo#{2+2}bar"') }
+      test('"foo#{hostname}"') { assert_text_parsed_as("foo#{Socket.gethostname}", '"foo#{hostname}"') }
+      test('"foo#{worker_id}"') {
+        ENV.delete('SERVERENGINE_WORKER_ID')
+        assert_text_parsed_as("foo", '"foo#{worker_id}"')
+        ENV['SERVERENGINE_WORKER_ID'] = '1'
+        assert_text_parsed_as("foo1", '"foo#{worker_id}"')
+        ENV.delete('SERVERENGINE_WORKER_ID')
+      }
     end
 
     sub_test_case 'array parsing' do