diff --git a/src/pavucontrol.glade b/src/pavucontrol.glade
index 3a50fb9..c16a2ba 100644
--- a/src/pavucontrol.glade
+++ b/src/pavucontrol.glade
@@ -310,7 +310,7 @@
                               <object class="GtkImage" id="image18">
                                 <property name="visible">True</property>
                                 <property name="can_focus">False</property>
-                                <property name="icon_name">stock_lock</property>
+                                <property name="icon_name">security-medium</property>
                                 <property name="icon-size">1</property>
                               </object>
                             </child>
@@ -1509,7 +1509,7 @@
                               <object class="GtkImage" id="image18">
                                 <property name="visible">True</property>
                                 <property name="can_focus">False</property>
-                                <property name="icon_name">stock_lock</property>
+                                <property name="icon_name">security-medium</property>
                                 <property name="icon-size">1</property>
                               </object>
                             </child>