diff --git a/source/blender/editors/space_outliner/outliner_sync.cc b/source/blender/editors/space_outliner/outliner_sync.cc
index 3f9a0210553..670c6ef8f04 100644
--- a/source/blender/editors/space_outliner/outliner_sync.cc
+++ b/source/blender/editors/space_outliner/outliner_sync.cc
@@ -35,6 +35,8 @@
 #include "WM_api.hh"
 #include "WM_types.hh"
 
+#include "tree/tree_element_seq.hh"
+
 #include "outliner_intern.hh"
 
 void ED_outliner_select_sync_from_object_tag(bContext *C)
@@ -288,9 +290,12 @@ static void outliner_select_sync_to_pose_bone(TreeElement *te,
   }
 }
 
-static void outliner_select_sync_to_sequence(Scene *scene, TreeStoreElem *tselem)
+static void outliner_select_sync_to_sequence(Scene *scene, const TreeElement *te)
 {
-  Sequence *seq = (Sequence *)tselem->id;
+  const TreeStoreElem *tselem = TREESTORE(te);
+
+  const TreeElementSequence *te_sequence = tree_element_cast<TreeElementSequence>(te);
+  Sequence *seq = &te_sequence->getSequence();
 
   if (tselem->flag & TSE_ACTIVE) {
     SEQ_select_active_set(scene, seq);
@@ -333,7 +338,7 @@ static void outliner_sync_selection_from_outliner(Scene *scene,
     }
     else if (tselem->type == TSE_SEQUENCE) {
       if (sync_types->sequence) {
-        outliner_select_sync_to_sequence(scene, tselem);
+        outliner_select_sync_to_sequence(scene, te);
       }
     }
 
@@ -464,9 +469,12 @@ static void outliner_select_sync_from_pose_bone(bPoseChannel *pchan_active,
   }
 }
 
-static void outliner_select_sync_from_sequence(Sequence *sequence_active, TreeStoreElem *tselem)
+static void outliner_select_sync_from_sequence(Sequence *sequence_active, const TreeElement *te)
 {
-  Sequence *seq = (Sequence *)tselem->id;
+  TreeStoreElem *tselem = TREESTORE(te);
+
+  const TreeElementSequence *te_sequence = tree_element_cast<TreeElementSequence>(te);
+  const Sequence *seq = &te_sequence->getSequence();
 
   if (seq == sequence_active) {
     tselem->flag |= TSE_ACTIVE;
@@ -522,7 +530,7 @@ static void outliner_sync_selection_to_outliner(const Scene *scene,
     }
     else if (tselem->type == TSE_SEQUENCE) {
       if (sync_types->sequence) {
-        outliner_select_sync_from_sequence(active_data->sequence, tselem);
+        outliner_select_sync_from_sequence(active_data->sequence, te);
       }
     }
     else {