diff --git a/source/blender/editors/space_outliner/outliner_tree.cc b/source/blender/editors/space_outliner/outliner_tree.cc
index a3bd174e2d6..9acb814e1c9 100644
--- a/source/blender/editors/space_outliner/outliner_tree.cc
+++ b/source/blender/editors/space_outliner/outliner_tree.cc
@@ -378,8 +378,12 @@ TreeElement *outliner_add_element(SpaceOutliner *space_outliner,
                 TSE_SEQ_STRIP,
                 TSE_SEQUENCE_DUP,
                 TSE_GENERIC_LABEL) ||
-           ELEM(
-               type, TSE_DEFGROUP, TSE_DEFGROUP_BASE, TSE_GPENCIL_EFFECT, TSE_GPENCIL_EFFECT_BASE))
+           ELEM(type,
+                TSE_DEFGROUP,
+                TSE_DEFGROUP_BASE,
+                TSE_GPENCIL_EFFECT,
+                TSE_GPENCIL_EFFECT_BASE,
+                TSE_R_LAYER_BASE))
   {
     BLI_assert_msg(false, "Element type should already use new AbstractTreeElement design");
   }