diff --git a/src/Client.cpp b/src/Client.cpp
index 0fd885a4..d41294a0 100644
--- a/src/Client.cpp
+++ b/src/Client.cpp
@@ -927,6 +927,6 @@ void CClient::HandleCap(const CString& sLine)
 		}
 		RespondCap("ACK :" + sList.TrimSuffix_n(" "));
 	} else {
-		PutClient(":irc.znc.in 410 " + GetNick() + " :Invalid CAP subcommand");
+		PutClient(":irc.znc.in 410 " + GetNick() + " " + sSubCmd + " :Invalid CAP subcommand");
 	}
 }