diff --git a/client/js/controllers/user_registration_controller.js b/client/js/controllers/user_registration_controller.js
index 89cfd8cd..72a52b5e 100644
--- a/client/js/controllers/user_registration_controller.js
+++ b/client/js/controllers/user_registration_controller.js
@@ -30,7 +30,7 @@ class UserRegistrationController {
         user.email = e.detail.email;
         user.password = e.detail.password;
         const isLoggedIn = api.isLoggedIn();
-        user.save()
+        user.save(e.detail.recaptchaToken)
             .then(() => {
                 if (isLoggedIn) {
                     return Promise.resolve();
diff --git a/client/js/models/user.js b/client/js/models/user.js
index 28dc3efe..e682f4b4 100644
--- a/client/js/models/user.js
+++ b/client/js/models/user.js
@@ -107,7 +107,7 @@ class User extends events.EventTarget {
         });
     }
 
-    save() {
+    save(recaptchaToken) {
         const files = [];
         const detail = { version: this._version };
         const transient = this._orig._name;
@@ -131,13 +131,16 @@ class User extends events.EventTarget {
         if (this._password) {
             detail.password = this._password;
         }
+        if (!api.isLoggedIn()) {
+            detail.recaptchaToken = recaptchaToken;
+        }
 
         let promise = this._orig._name
             ? api.put(
-                  uri.formatApiLink("user", this._orig._name),
-                  detail,
-                  files
-              )
+                uri.formatApiLink("user", this._orig._name),
+                detail,
+                files
+            )
             : api.post(uri.formatApiLink("users"), detail, files);
 
         return promise.then((response) => {
diff --git a/client/js/views/registration_view.js b/client/js/views/registration_view.js
index c14a13fe..f2bbcb7d 100644
--- a/client/js/views/registration_view.js
+++ b/client/js/views/registration_view.js
@@ -22,7 +22,10 @@ class RegistrationView extends events.EventTarget {
         views.decorateValidator(this._formNode);
         this._formNode.addEventListener("submit", (e) => this._evtSubmit(e));
         this.setRecaptchaToken = this.setRecaptchaToken.bind(this);
-        this.renderRecaptcha();
+
+        // Show the recaptcha for anonymous users.
+        if (!api.isLoggedIn())
+            this.renderRecaptcha();
     }
 
     renderRecaptcha() {