diff --git a/src/plugins/autotest/testresultdelegate.cpp b/src/plugins/autotest/testresultdelegate.cpp
index 9bd01925848..c6401343b17 100644
--- a/src/plugins/autotest/testresultdelegate.cpp
+++ b/src/plugins/autotest/testresultdelegate.cpp
@@ -181,6 +181,12 @@ void TestResultDelegate::currentChanged(const QModelIndex &current, const QModel
     emit sizeHintChanged(previous);
 }
 
+void TestResultDelegate::clearCache()
+{
+    m_lastProcessedIndex = QModelIndex();
+    m_lastProcessedFont = QFont();
+}
+
 void TestResultDelegate::recalculateTextLayout(const QModelIndex &index, const QString &output,
                                                const QFont &font, int width) const
 {
diff --git a/src/plugins/autotest/testresultdelegate.h b/src/plugins/autotest/testresultdelegate.h
index 7d94c76c18d..2161906a606 100644
--- a/src/plugins/autotest/testresultdelegate.h
+++ b/src/plugins/autotest/testresultdelegate.h
@@ -42,6 +42,7 @@ public:
     void paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const override;
     QSize sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const override;
     void currentChanged(const QModelIndex &current, const QModelIndex &previous);
+    void clearCache();
 
 private:
     void recalculateTextLayout(const QModelIndex &index, const QString &output,
diff --git a/src/plugins/autotest/testresultspane.cpp b/src/plugins/autotest/testresultspane.cpp
index 9f2f8431ea1..6324770ca89 100644
--- a/src/plugins/autotest/testresultspane.cpp
+++ b/src/plugins/autotest/testresultspane.cpp
@@ -275,6 +275,8 @@ int TestResultsPane::priorityInStatusBar() const
 void TestResultsPane::clearContents()
 {
     m_filterModel->clearTestResults();
+    if (auto delegate = qobject_cast<TestResultDelegate *>(m_treeView->itemDelegate()))
+        delegate->clearCache();
     setIconBadgeNumber(0);
     navigateStateChanged();
     m_summaryWidget->setVisible(false);