diff --git a/src/widgets/JupyterWidget.h b/src/widgets/JupyterWidget.h
index 5bd49c1f..5704b957 100644
--- a/src/widgets/JupyterWidget.h
+++ b/src/widgets/JupyterWidget.h
@@ -17,6 +17,8 @@ namespace Ui
 
 class JupyterWebView;
 
+class QTabWidget;
+
 class JupyterWidget : public QDockWidget
 {
 Q_OBJECT