diff --git a/lib/fluent/supervisor.rb b/lib/fluent/supervisor.rb
index 854e53cb12..9584019de7 100644
--- a/lib/fluent/supervisor.rb
+++ b/lib/fluent/supervisor.rb
@@ -1104,6 +1104,11 @@ def build_spawn_command
         fluentd_spawn_cmd << '-Eascii-8bit:ascii-8bit'
       end
 
+      if @system_config.enable_jit
+        $log.info "enable Ruby JIT for workers (--jit)"
+        fluentd_spawn_cmd << '--jit'
+      end
+
       # Adding `-h` so that it can avoid ruby's command blocking
       # e.g. `ruby -Eascii-8bit:ascii-8bit` will block. but `ruby -Eascii-8bit:ascii-8bit -h` won't.
       _, e, s = Open3.capture3(*fluentd_spawn_cmd, "-h")
diff --git a/lib/fluent/system_config.rb b/lib/fluent/system_config.rb
index df2f2387a7..5fb781d72b 100644
--- a/lib/fluent/system_config.rb
+++ b/lib/fluent/system_config.rb
@@ -28,7 +28,7 @@ class SystemConfig
       :without_source, :rpc_endpoint, :enable_get_dump, :process_name,
       :file_permission, :dir_permission, :counter_server, :counter_client,
       :strict_config_value, :enable_msgpack_time_support, :disable_shared_socket,
-      :metrics, :enable_input_metrics, :enable_size_metrics
+      :metrics, :enable_input_metrics, :enable_size_metrics, :enable_jit
     ]
 
     config_param :workers,   :integer, default: 1
@@ -50,6 +50,7 @@ class SystemConfig
     config_param :disable_shared_socket, :bool, default: nil
     config_param :enable_input_metrics, :bool, default: nil
     config_param :enable_size_metrics, :bool, default: nil
+    config_param :enable_jit, :bool, default: false
     config_param :file_permission, default: nil do |v|
       v.to_i(8)
     end
diff --git a/test/config/test_system_config.rb b/test/config/test_system_config.rb
index d347bbe828..7b18cb3dd1 100644
--- a/test/config/test_system_config.rb
+++ b/test/config/test_system_config.rb
@@ -84,6 +84,7 @@ def parse_text(text)
       assert_nil(sc.enable_input_metrics)
       assert_nil(sc.enable_size_metrics)
       assert_nil(sc.enable_msgpack_time_support)
+      assert(!sc.enable_jit)
       assert_equal(:text, sc.log.format)
       assert_equal('%Y-%m-%d %H:%M:%S %z', sc.log.time_format)
     end
@@ -102,6 +103,7 @@ def parse_text(text)
       'enable_msgpack_time_support' => ['enable_msgpack_time_support', true],
       'enable_input_metrics' => ['enable_input_metrics', true],
       'enable_size_metrics' => ['enable_size_metrics', true],
+      'enable_jit' => ['enable_jit', true],
     )
     test "accepts parameters" do |(k, v)|
       conf = parse_text(<<-EOS)