diff --git a/.travis.yml b/.travis.yml
index aaf414d4e..b60270840 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -33,6 +33,11 @@ env:
   - CLOUDDATA_HOST_VAR=CLOUDDATA_HOST_$TRAVIS_BRANCH
   - CLOUDDATA_HOST=${!CLOUDDATA_HOST_VAR}
   - CLOUDDATA_HOST=${CLOUDDATA_HOST:-$CLOUDDATA_HOST_STAGING}
+  - RECAPTCHA_SITE_KEY_master=6LeRbUwUAAAAAFYhKgk3G9OKWqE_OJ7Z-7VTUCbl
+  - RECAPTCHA_SITE_KEY_STAGING=6LfukK4UAAAAAFR44yoZMhv8fj6xh-PMiIxwryG3
+  - RECAPTCHA_SITE=RECAPTCHA_SITE_KEY_$TRAVIS_BRANCH
+  - RECAPTCHA_SITE_KEY=${!RECAPTCHA_SITE_KEY_VAR}
+  - RECAPTCHA_SITE_KEY=${RECAPTCHA_SITE_KEY:-$RECAPTCHA_SITE_KEY_STAGING}
   - ROOT_URL_master=https://scratch.mit.edu
   - ROOT_URL_STAGING=https://scratch.ly
   - ROOT_URL_VAR=ROOT_URL_$TRAVIS_BRANCH
diff --git a/src/components/join-flow/email-step.jsx b/src/components/join-flow/email-step.jsx
index 30db18a5d..4e2b28d57 100644
--- a/src/components/join-flow/email-step.jsx
+++ b/src/components/join-flow/email-step.jsx
@@ -40,7 +40,7 @@ class EmailStep extends React.Component {
         this.widgetId = this.grecaptcha.render(this.captchaRef,
             {
                 callback: this.captchaSolved,
-                sitekey: ''
+                sitekey: process.env.RECAPTCHA_SITE_KEY
             },
             true);
     }
@@ -145,7 +145,7 @@ class EmailStep extends React.Component {
                             <div
                                 className="g-recaptcha"
                                 data-badge="bottomright"
-                                data-sitekey=""
+                                data-sitekey={process.env.RECAPTCHA_SITE_KEY}
                                 data-size="invisible"
                                 ref={this.setCaptchaRef}
                             />
diff --git a/webpack.config.js b/webpack.config.js
index 3118a4bb5..a2fe4fcbc 100644
--- a/webpack.config.js
+++ b/webpack.config.js
@@ -173,6 +173,8 @@ module.exports = {
             new webpack.DefinePlugin({
                 'process.env.NODE_ENV': '"' + (process.env.NODE_ENV || 'development') + '"',
                 'process.env.API_HOST': '"' + (process.env.API_HOST || 'https://api.scratch.mit.edu') + '"',
+                'process.env.RECAPTCHA_SITE_KEY': '"' +
+                        (process.env.RECAPTCHA_SITE_KEY || '6Lf6kK4UAAAAABKTyvdSqgcSVASEnMrCquiAkjVW') + '"',
                 'process.env.ASSET_HOST': '"' + (process.env.ASSET_HOST || 'https://assets.scratch.mit.edu') + '"',
                 'process.env.BACKPACK_HOST': '"' + (process.env.BACKPACK_HOST || 'https://backpack.scratch.mit.edu') + '"',
                 'process.env.CLOUDDATA_HOST': '"' + (process.env.CLOUDDATA_HOST || 'clouddata.scratch.mit.edu') + '"',