diff --git a/lisp/build-ros.lisp b/lisp/build-ros.lisp
index 525a54f..2919f2f 100644
--- a/lisp/build-ros.lisp
+++ b/lisp/build-ros.lisp
@@ -20,7 +20,8 @@
             for line = (read-line in)
             when (ignore-errors (string= line "exec" :end1 4))
               do (setf opts (parse-argv line))))
-    (roswell:roswell `(,opts "-L" ,(or (ros:opt "*lisp")
-                                       (ros:opt "default.lisp"))
-                             "dump" ,@(rest argv) "executable" ,(first argv))
+    (roswell:roswell `(,@(when (roswell:verbose) '("-v"))
+                         ,opts "-L" ,(or (ros:opt "*lisp")
+                                         (ros:opt "default.lisp"))
+                         "dump" ,@(rest argv) "executable" ,(first argv))
                      :interactive nil)))