diff --git a/swf/tag.py b/swf/tag.py
index a6f20a9..01f5bc9 100644
--- a/swf/tag.py
+++ b/swf/tag.py
@@ -152,7 +152,7 @@ def __init__(self):
     def get_dependencies(self):
         """ Returns the character ids this tag refers to """
         s = super(SWFTimelineContainer, self).get_dependencies()
-        for dt in self.all_tags_of_type(DefinitionTag):
+        for dt in self.all_tags_of_type((DefinitionTag, TagPlaceObject)):
             s.update(dt.get_dependencies())
         return s