diff --git a/admin_frontend/src/web_api.rs b/admin_frontend/src/web_api.rs
index 71bbed5c..fb33b9ff 100644
--- a/admin_frontend/src/web_api.rs
+++ b/admin_frontend/src/web_api.rs
@@ -244,7 +244,11 @@ pub async fn login_handler(
               .sign_up_with_referrer(
                 &param.email,
                 &param.password,
-                Some(&get_base_url(&header_map)),
+                Some(&get_header_value_or_default(
+                  &header_map,
+                  "host",
+                  "localhost",
+                )),
               )
               .await;