diff --git a/src/plugins/help/litehtmlhelpviewer.cpp b/src/plugins/help/litehtmlhelpviewer.cpp
index 44fda661076..c33ebf62ef5 100644
--- a/src/plugins/help/litehtmlhelpviewer.cpp
+++ b/src/plugins/help/litehtmlhelpviewer.cpp
@@ -66,6 +66,7 @@ LiteHtmlHelpViewer::LiteHtmlHelpViewer(QWidget *parent)
     , m_viewer(new QLiteHtmlWidget)
 {
     m_viewer->setResourceHandler([](const QUrl &url) { return getData(url); });
+    m_viewer->setFrameStyle(QFrame::NoFrame);
     m_viewer->viewport()->installEventFilter(this);
     connect(m_viewer, &QLiteHtmlWidget::linkClicked, this, &LiteHtmlHelpViewer::setSource);
     connect(m_viewer,
diff --git a/src/plugins/help/textbrowserhelpviewer.cpp b/src/plugins/help/textbrowserhelpviewer.cpp
index e5188c1d25b..fd6c36c4d4a 100644
--- a/src/plugins/help/textbrowserhelpviewer.cpp
+++ b/src/plugins/help/textbrowserhelpviewer.cpp
@@ -267,6 +267,7 @@ TextBrowserHelpWidget::TextBrowserHelpWidget(TextBrowserHelpViewer *parent)
     : QTextBrowser(parent)
     , m_parent(parent)
 {
+    setFrameShape(QFrame::NoFrame);
     installEventFilter(this);
     document()->setDocumentMargin(8);
 }