diff --git a/ghost/admin/app/components/modals/settings/signup-form-embed.js b/ghost/admin/app/components/modals/settings/signup-form-embed.js
index 51c56833c6..3123cfc3f6 100644
--- a/ghost/admin/app/components/modals/settings/signup-form-embed.js
+++ b/ghost/admin/app/components/modals/settings/signup-form-embed.js
@@ -94,7 +94,7 @@ export default class SignupFormEmbedModal extends Component {
         if (this.style === 'all-in-one') {
             // We serve twice the size of the icon to support high resolution screens
             // (note that you'll need to change the resolution in the backend config as well, as not all resolutions are supported)
-            options.logo = this.settings.icon.replace(/\/content\/images\//, '/content/images/size/w128h128/');
+            options.logo = this.settings.icon.replace(/\/content\/images\//, '/content/images/size/w192h192/');
             options.title = this.settings.title;
             options.description = this.settings.description;
 
diff --git a/ghost/core/core/shared/config/overrides.json b/ghost/core/core/shared/config/overrides.json
index b4974408f1..e67c7ab98a 100644
--- a/ghost/core/core/shared/config/overrides.json
+++ b/ghost/core/core/shared/config/overrides.json
@@ -121,7 +121,7 @@
         },
         "internalImageSizes": {
             "icon": {"width": 256, "height": 256},
-            "signup-form-icon": {"width": 128, "height": 128},
+            "signup-form-icon": {"width": 192, "height": 192},
             "email-header-image": {"width": 1200},
             "email-latest-posts-image": {"width": 200, "height": 200},
             "email-latest-posts-image-mobile": {"width": 1200, "height": 960}