diff --git a/ghost/portal/README.md b/ghost/portal/README.md
index 9e2b9297c2..236ca5b9f2 100644
--- a/ghost/portal/README.md
+++ b/ghost/portal/README.md
@@ -32,7 +32,7 @@ By default, the script adds a default floating trigger button on the bottom righ
 
 Its possible to add custom trigger button of your own by adding data attribute `data-portal` to any HTML tag on page, and also specify a specfic [page](https://github.com/TryGhost/Portal/blob/master/src/pages.js#L13-L22) to open from it by using it as `data-portal=signup`.
 
-The script also adds custom class names to this element for open and close state of popup - `gh-members-popup-open` and `gh-members-popup-close`, allowing devs to update its UI based on popup state.
+The script also adds custom class names to this element for open and close state of popup - `gh-portal-open` and `gh-portal-close`, allowing devs to update its UI based on popup state.
 
 ## Basic Setup
 
diff --git a/ghost/portal/src/App.js b/ghost/portal/src/App.js
index 86482039db..bc620287d2 100644
--- a/ghost/portal/src/App.js
+++ b/ghost/portal/src/App.js
@@ -77,7 +77,7 @@ export default class App extends React.Component {
             }
         };
         const customTriggerSelector = '[data-portal]';
-        const popupCloseClass = 'gh-members-popup-close';
+        const popupCloseClass = 'gh-portal-close';
         this.customTriggerButtons = document.querySelectorAll(customTriggerSelector) || [];
         this.customTriggerButtons.forEach((customTriggerButton) => {
             customTriggerButton.classList.add(popupCloseClass);
@@ -89,8 +89,8 @@ export default class App extends React.Component {
 
     /** Handle portal class set on custom trigger buttons */
     handleCustomTriggerClassUpdate() {
-        const popupOpenClass = 'gh-members-popup-open';
-        const popupCloseClass = 'gh-members-popup-close';
+        const popupOpenClass = 'gh-portal-open';
+        const popupCloseClass = 'gh-portal-close';
         this.customTriggerButtons.forEach((customButton) => {
             const elAddClass = this.state.showPopup ? popupOpenClass : popupCloseClass;
             const elRemoveClass = this.state.showPopup ? popupCloseClass : popupOpenClass;