diff --git a/web/src/features/auth/RegisterPage.tsx b/web/src/features/auth/RegisterPage.tsx
index 9f276785..60d357c1 100644
--- a/web/src/features/auth/RegisterPage.tsx
+++ b/web/src/features/auth/RegisterPage.tsx
@@ -6,7 +6,7 @@ import { Icon } from '@/app/Icon';
 import { PasswordInput } from '@/features/auth/components/PasswordInput';
 import { VerificationCodeButton } from '@/features/auth/components/VerificationCodeButton';
 import { verifyRegistrationCode } from '@/lib/api/auth';
-import { apiBase, ImApiError } from '@/lib/api/client';
+import { fileBase, ImApiError } from '@/lib/api/client';
 import { getTinode, registerBasic } from '@/lib/tinode/connection';
 import { loginErrorMessage, validateCredentialsMessage } from '@/lib/tinode/errors';
 import { useSessionStore } from '@/stores/session';
@@ -38,7 +38,9 @@ export function RegisterPage() {
 
   if (!tenant) return <Navigate to="/tenant" replace />;
   const minPasswordLength = tenant.passwordPolicy?.minLength ?? 8;
-  const legalOrigin = new URL(apiBase(), window.location.href).origin;
+  // The deployed file endpoint is pinned to the IM API host; the web host serves
+  // unknown /legal/* paths as the SPA index instead of the actual agreements.
+  const legalOrigin = new URL(fileBase(), window.location.href).origin;
 
   const submit = async (event: React.FormEvent) => {
     event.preventDefault();