diff --git a/panda/src/chan/animGroup.h b/panda/src/chan/animGroup.h
index ba5fee7b6f..d712d8ef5b 100644
--- a/panda/src/chan/animGroup.h
+++ b/panda/src/chan/animGroup.h
@@ -55,6 +55,7 @@ public:
 
   void sort_descendants();
 
+PUBLISHED:
   virtual void output(ostream &out) const;
   virtual void write(ostream &out, int indent_level) const;