diff --git a/core/src/avm2/globals/flash/display/displayobjectcontainer.rs b/core/src/avm2/globals/flash/display/displayobjectcontainer.rs
index 14cd9fd9a..92ca78cba 100644
--- a/core/src/avm2/globals/flash/display/displayobjectcontainer.rs
+++ b/core/src/avm2/globals/flash/display/displayobjectcontainer.rs
@@ -470,6 +470,12 @@ pub fn swap_children_at<'gc>(
                 return Err(format!("RangeError: Index {} is out of bounds", index1).into());
             }
 
+            let child0 = ctr.child_by_id(index0 as usize).unwrap();
+            let child1 = ctr.child_by_id(index1 as usize).unwrap();
+
+            child0.set_placed_by_script(activation.context.gc_context, true);
+            child1.set_placed_by_script(activation.context.gc_context, true);
+
             ctr.swap_at_id(&mut activation.context, index0 as usize, index1 as usize);
         }
     }
@@ -509,6 +515,9 @@ pub fn swap_children<'gc>(
                 .position(|a| DisplayObject::ptr_eq(a, child1))
                 .ok_or("ArgumentError: Child is not a child of this display object")?;
 
+            child0.set_placed_by_script(activation.context.gc_context, true);
+            child1.set_placed_by_script(activation.context.gc_context, true);
+
             ctr.swap_at_id(&mut activation.context, index0, index1);
         }
     }