diff --git a/src/Discord.Net/DiscordClient.cs b/src/Discord.Net/DiscordClient.cs
index 68f46173f..ff73571a5 100644
--- a/src/Discord.Net/DiscordClient.cs
+++ b/src/Discord.Net/DiscordClient.cs
@@ -581,7 +581,7 @@ namespace Discord
 								}
 							}
 
-							if (Config.AckMessages && isAuthor)
+							if (Config.AckMessages && !isAuthor)
 								await _api.AckMessage(data.Id, data.ChannelId);
 
 							if (hasFinishedSending)