diff --git a/indra/newview/llimview.cpp b/indra/newview/llimview.cpp
index a3c338831c957313ffe691cf250692be91a8b2e4..067f0d199301d6d403f49a6878eb75801fe69406 100644
--- a/indra/newview/llimview.cpp
+++ b/indra/newview/llimview.cpp
@@ -228,7 +228,8 @@ void on_new_message(const LLSD& msg)
             //The conversation floater isn't focused/open
             if(conversation_floater_not_focused)
             {
-            	if(!LLMuteList::getInstance()->isMuted(participant_id))
+            	if(!LLMuteList::getInstance()->isMuted(participant_id) 
+                    && !gAgent.isDoNotDisturb())
             	{
             		gToolBarView->flashCommand(LLCommandId("chat"), true);
             	}