diff --git a/ircd/resource.cc b/ircd/resource.cc
index a0a8b11f1..7cf981f0f 100644
--- a/ircd/resource.cc
+++ b/ircd/resource.cc
@@ -662,7 +662,8 @@ const try
 		throw m::error
 		{
 			http::UNAUTHORIZED, "M_NOT_MY_HOST",
-			"The X-Matrix Authorization destination host is not recognized here."
+			"The X-Matrix Authorization destination '%s' is not recognized here.",
+			request.head.host
 		};
 
 	const m::request::x_matrix x_matrix