diff --git a/sw/source/uibase/sidebar/A11yCheckIssuesPanel.cxx b/sw/source/uibase/sidebar/A11yCheckIssuesPanel.cxx
index e86d28e3ad57..a898f9c5384d 100644
--- a/sw/source/uibase/sidebar/A11yCheckIssuesPanel.cxx
+++ b/sw/source/uibase/sidebar/A11yCheckIssuesPanel.cxx
@@ -99,6 +99,7 @@ IMPL_LINK_NOARG(AccessibilityCheckEntry, FixButtonClicked, weld::Button&, void)
 
 AccessibilityCheckLevel::AccessibilityCheckLevel(weld::Box* pParent)
     : m_xBuilder(Application::CreateBuilder(pParent, u"svx/ui/accessibilitychecklevel.ui"_ustr))
+    , m_xContainer(m_xBuilder->weld_box(u"accessibilityCheckLevelBox"_ustr))
 {
     m_xExpanders[0] = m_xBuilder->weld_expander(u"expand_document"_ustr);
     m_xExpanders[1] = m_xBuilder->weld_expander(u"expand_styles"_ustr);
diff --git a/sw/source/uibase/sidebar/A11yCheckIssuesPanel.hxx b/sw/source/uibase/sidebar/A11yCheckIssuesPanel.hxx
index 5183d5170151..96e6079a5b0d 100644
--- a/sw/source/uibase/sidebar/A11yCheckIssuesPanel.hxx
+++ b/sw/source/uibase/sidebar/A11yCheckIssuesPanel.hxx
@@ -63,6 +63,7 @@ class AccessibilityCheckLevel
 {
 private:
     std::unique_ptr<weld::Builder> m_xBuilder;
+    std::unique_ptr<weld::Box> m_xContainer; ///< this is required for gtk3 even if unused
     std::array<std::vector<std::unique_ptr<AccessibilityCheckEntry>>, 11> m_aEntries;
     std::array<std::unique_ptr<weld::Expander>, 11> m_xExpanders;
     std::array<std::unique_ptr<weld::Box>, 11> m_xBoxes;