diff --git a/app/assets/javascripts/fix_legacy_clients.js b/app/assets/javascripts/fix_legacy_clients.js
new file mode 100644
index 0000000..e737ea8
--- /dev/null
+++ b/app/assets/javascripts/fix_legacy_clients.js
@@ -0,0 +1,5 @@
+if ('OpenFest-gauge-api' in localStorage) {
+    if (localStorage['OpenFest-gauge-api'].startsWith('http://')) {
+        localStorage['OpenFest-gauge-api'] = localStorage['OpenFest-gauge-api'].replace(/^http:\/\//, 'https://');
+    }
+}