diff --git a/gpt4all-chat/src/modellist.cpp b/gpt4all-chat/src/modellist.cpp
index 226c7202..4d2bd17c 100644
--- a/gpt4all-chat/src/modellist.cpp
+++ b/gpt4all-chat/src/modellist.cpp
@@ -21,6 +21,7 @@
 #include <QJsonDocument>
 #include <QJsonObject>
 #include <QJsonValue>
+#include <QMutexLocker>
 #include <QNetworkRequest>
 #include <QObject>
 #include <QRegularExpression>