diff --git a/README.md b/README.md
index 0b8e297..4b1dcee 100644
--- a/README.md
+++ b/README.md
@@ -59,7 +59,7 @@ With following configuration, you can access http://localhost:24231/metrics on a
 
 More configuration parameters:
 
-- `bind`: binding interface (default: '0.0.0.0')
+- `bind`: binding interface (default: '127.0.0.1')
 - `port`: listen port (default: 24231)
 - `metrics_path`: metrics HTTP endpoint (default: /metrics)
 - `aggregated_metrics_path`: metrics HTTP endpoint (default: /aggregated_metrics)
diff --git a/lib/fluent/plugin/in_prometheus.rb b/lib/fluent/plugin/in_prometheus.rb
index 862e298..22b5d71 100644
--- a/lib/fluent/plugin/in_prometheus.rb
+++ b/lib/fluent/plugin/in_prometheus.rb
@@ -11,7 +11,7 @@ class PrometheusInput < Fluent::Plugin::Input
 
     helpers :thread, :http_server
 
-    config_param :bind, :string, default: '0.0.0.0'
+    config_param :bind, :string, default: '127.0.0.1'
     config_param :port, :integer, default: 24231
     config_param :metrics_path, :string, default: '/metrics'
     config_param :aggregated_metrics_path, :string, default: '/aggregated_metrics'
diff --git a/spec/fluent/plugin/in_prometheus_spec.rb b/spec/fluent/plugin/in_prometheus_spec.rb
index 8bff55f..a343e58 100644
--- a/spec/fluent/plugin/in_prometheus_spec.rb
+++ b/spec/fluent/plugin/in_prometheus_spec.rb
@@ -22,9 +22,16 @@
   describe '#configure' do
     describe 'bind' do
       let(:config) { CONFIG + %[
-  bind 127.0.0.1
+  bind ::1
 ] }
       it 'should be configurable' do
+        expect(driver.instance.bind).to eq('::1')
+      end
+    end
+
+    describe 'default bind' do
+      let(:config) { CONFIG }
+      it 'should be accessible from 127.0.0.1 by default' do
         expect(driver.instance.bind).to eq('127.0.0.1')
       end
     end