diff --git a/lib/core/Site.js b/lib/core/Site.js
index 6506e0ed74a5..2a0cbed81631 100644
--- a/lib/core/Site.js
+++ b/lib/core/Site.js
@@ -124,6 +124,11 @@ class Site extends React.Component {
                 dangerouslySetInnerHTML={{
                   __html: `
               var search = docsearch({
+                ${
+                  this.props.config.algolia.appId
+                    ? `appId: '${this.props.config.algolia.appId}',`
+                    : ''
+                }
                 apiKey: '${this.props.config.algolia.apiKey}',
                 indexName: '${this.props.config.algolia.indexName}',
                 inputSelector: '#search_input_react',
@@ -141,6 +146,11 @@ class Site extends React.Component {
                 dangerouslySetInnerHTML={{
                   __html: `
               var search = docsearch({
+                ${
+                  this.props.config.algolia.appId
+                    ? `appId: '${this.props.config.algolia.appId}',`
+                    : ''
+                }
                 apiKey: '${this.props.config.algolia.apiKey}',
                 indexName: '${this.props.config.algolia.indexName}',
                 inputSelector: '#search_input_react'