diff --git a/auth/middleware.go b/auth/middleware.go
index 3383fcb4ff485ea135dde0a120d84f637bc039a9..a8bda2a9843324d6ea8a14af6abc5b2ecad28b8c 100644
--- a/auth/middleware.go
+++ b/auth/middleware.go
@@ -267,7 +267,7 @@ 			break
 		}
 	}
 	if !ok {
-		authError(w, "Invalid source IP for internal auth", http.StatusUnauthorized)
+		authError(w, fmt.Sprintf("Invalid source IP %s for internal auth", ip), http.StatusUnauthorized)
 		return
 	}