diff --git a/public/offline.html b/public/offline.html
index 0f3160a..02fefda 100644
--- a/public/offline.html
+++ b/public/offline.html
@@ -34,7 +34,11 @@
 
         function go() {
             if (navigator.onLine) {
-                windowProxy = window.open("<!--MIRROR_URL-->/#/?migrate=1", "_blank");
+                let url = "<!--MIRROR_URL-->/#/?migrate=1";
+                if (!url.includes("://")) {
+                    url = window.location.protocol + "//" + url;
+                }
+                windowProxy = window.open(url, "_blank");
             }
         }
 
@@ -68,7 +72,11 @@
                 } else if (data !== null && data.cmd == "migrationDone") {
                     if (windowProxy) {
                         windowProxy.close();
-                        window.location.href = "<!--MIRROR_URL-->/#/";
+                        let url = "<!--MIRROR_URL-->/#/";
+                        if (!url.includes("://")) {
+                            url = window.location.protocol + "//" + url;
+                        }
+                        window.location.href = url;
                     }
                 }
             } catch (error) {