diff --git a/src/ExtendedTableWidget.cpp b/src/ExtendedTableWidget.cpp
index cb39feff..c4f4e93c 100644
--- a/src/ExtendedTableWidget.cpp
+++ b/src/ExtendedTableWidget.cpp
@@ -200,7 +200,7 @@ void ExtendedTableWidget::keyPressEvent(QKeyEvent* event)
         {
             // When pressing Alt+Delete set the value to NULL
             foreach(const QModelIndex& index, selectedIndexes())
-                model()->setData(index, QString());
+                model()->setData(index, QVariant());
         } else {
             // When pressing Delete only set the value to empty string
             foreach(const QModelIndex& index, selectedIndexes())