diff --git a/aircox_cms/sections.py b/aircox_cms/sections.py
index 1a4c723..09e8ea9 100755
--- a/aircox_cms/sections.py
+++ b/aircox_cms/sections.py
@@ -999,7 +999,7 @@ class SectionTimetable(SectionItem,DatedListBase):
         MultiFieldPanel([
             FieldPanel('nav_visible'),
             FieldPanel('target'),
-        ], header=_('Navigation')),
+        ], heading=_('Navigation')),
     ]
 
     def get_queryset(self, context):