diff --git a/gajim/chat_control.py b/gajim/chat_control.py
index 57a4493ee..8631c0796 100644
--- a/gajim/chat_control.py
+++ b/gajim/chat_control.py
@@ -856,18 +856,18 @@ class ChatControl(ChatControlBase):
 
         self._show_lock_image(**encryption_state)
 
-    def _show_lock_image(self, visible, enc_type='',
-                         authenticated=False):
+    def _show_lock_image(self, visible, enc_type='', authenticated=False):
         """
         Set lock icon visibility and create tooltip
         """
         if authenticated:
             authenticated_string = _('and authenticated')
-            img_path = gtkgui_helpers.get_icon_path('security-high')
+            self.lock_image.set_from_icon_name(
+                'security-high', Gtk.IconSize.MENU)
         else:
             authenticated_string = _('and NOT authenticated')
-            img_path = gtkgui_helpers.get_icon_path('security-low')
-        self.lock_image.set_from_file(img_path)
+            self.lock_image.set_from_icon_name(
+                'security-low', Gtk.IconSize.MENU)
 
         tooltip = _('%(type)s encryption is active %(authenticated)s.') % {'type': enc_type, 'authenticated': authenticated_string}
 
diff --git a/gajim/groupchat_control.py b/gajim/groupchat_control.py
index 92bda930b..39f4121bf 100644
--- a/gajim/groupchat_control.py
+++ b/gajim/groupchat_control.py
@@ -785,18 +785,18 @@ class GroupchatControl(ChatControlBase):
 
         self._show_lock_image(**encryption_state)
 
-    def _show_lock_image(self, visible, enc_type='',
-                         authenticated=False):
+    def _show_lock_image(self, visible, enc_type='', authenticated=False):
         """
         Set lock icon visibility and create tooltip
         """
         if authenticated:
             authenticated_string = _('and authenticated')
-            img_path = gtkgui_helpers.get_icon_path('security-high')
+            self.lock_image.set_from_icon_name(
+                'security-high', Gtk.IconSize.MENU)
         else:
             authenticated_string = _('and NOT authenticated')
-            img_path = gtkgui_helpers.get_icon_path('security-low')
-        self.lock_image.set_from_file(img_path)
+            self.lock_image.set_from_icon_name(
+                'security-low', Gtk.IconSize.MENU)
 
         tooltip = _('%(type)s encryption is active %(authenticated)s.') % {
             'type': enc_type, 'authenticated': authenticated_string}