diff --git a/components/auth/login-form.tsx b/components/auth/login-form.tsx
index c11c88d..70d0a96 100644
--- a/components/auth/login-form.tsx
+++ b/components/auth/login-form.tsx
@@ -302,7 +302,7 @@ export default function LoginForm() {
             </form>
 
             {/* Explicit passkey login button */}
-            {"PublicKeyCredential" in window && !showPassword && (
+            {"PublicKeyCredential" in globalThis && !showPassword && (
                 <button
                     onClick={handlePasskeyLogin}
                     disabled={isLoading}