diff --git a/chart2/uiconfig/ui/smoothlinesdlg.ui b/chart2/uiconfig/ui/smoothlinesdlg.ui
index 1d7d7deb8fde..3ba985cfa1cf 100644
--- a/chart2/uiconfig/ui/smoothlinesdlg.ui
+++ b/chart2/uiconfig/ui/smoothlinesdlg.ui
@@ -110,6 +110,7 @@
                     <property name="can-focus">False</property>
                     <property name="label" translatable="yes" context="smoothlinesdlg|TypeLabel">Line _Type:</property>
                     <property name="use-underline">True</property>
+                    <property name="mnemonic-widget">SplineTypeComboBox</property>
                     <property name="xalign">0</property>
                   </object>
                   <packing>
diff --git a/solenv/sanitizers/ui/modules/schart.suppr b/solenv/sanitizers/ui/modules/schart.suppr
index da1ebbe98f25..8d90b785ac1d 100644
--- a/solenv/sanitizers/ui/modules/schart.suppr
+++ b/solenv/sanitizers/ui/modules/schart.suppr
@@ -15,7 +15,6 @@ chart2/uiconfig/ui/sidebarerrorbar.ui://GtkSpinButton[@id='spinbutton_pos'] no-l
 chart2/uiconfig/ui/sidebarerrorbar.ui://GtkSpinButton[@id='spinbutton_neg'] no-labelled-by
 chart2/uiconfig/ui/sidebarerrorbar.ui://GtkLabel[@id='label5'] orphan-label
 chart2/uiconfig/ui/sidebarseries.ui://GtkLabel[@id='label_series_tmpl'] orphan-label
-chart2/uiconfig/ui/smoothlinesdlg.ui://GtkLabel[@id='TypeLabel'] orphan-label
 chart2/uiconfig/ui/titlerotationtabpage.ui://GtkLabel[@id='degreeL'] orphan-label
 chart2/uiconfig/ui/titlerotationtabpage.ui://GtkLabel[@id='labelABCD'] orphan-label
 chart2/uiconfig/ui/titlerotationtabpage.ui://GtkLabel[@id='textdirL'] orphan-label