diff --git a/src/webui/webapplication.cpp b/src/webui/webapplication.cpp
index 1394e1e46..65331f1ea 100644
--- a/src/webui/webapplication.cpp
+++ b/src/webui/webapplication.cpp
@@ -740,7 +740,7 @@ void WebApplication::sessionStart()
     connect(m_freeDiskSpaceChecker, &FreeDiskSpaceChecker::checked, syncController, &SyncController::updateFreeDiskSpace);
     m_currentSession->registerAPIController(u"sync"_s, syncController);
 
-    QNetworkCookie cookie {m_sessionCookieName.toLatin1(), m_currentSession->id().toUtf8()};
+    QNetworkCookie cookie {m_sessionCookieName.toLatin1(), m_currentSession->id().toLatin1()};
     cookie.setHttpOnly(true);
     cookie.setSecure(m_isSecureCookieEnabled && m_isHttpsEnabled);
     cookie.setPath(u"/"_s);