diff --git a/indra/newview/ao.h b/indra/newview/ao.h
index df4e9eea6c..49851d22b7 100644
--- a/indra/newview/ao.h
+++ b/indra/newview/ao.h
@@ -60,7 +60,7 @@ class FloaterAO
         void updateAnimationList();
 
         bool handleDragAndDrop(S32 x, S32 y, MASK mask, bool drop, EDragAndDropType cargo_type, void* cargo_data,
-                                  EAcceptance* accept, std::string& tooltip_msg);
+                                  EAcceptance* accept, std::string& tooltip_msg) override;
 
     protected:
         LLScrollListItem* addAnimation(const std::string& name);