diff --git a/tool/missing-baseruby.bat b/tool/missing-baseruby.bat
index b1c11aecb8..d5da5e1c72 100755
--- a/tool/missing-baseruby.bat
+++ b/tool/missing-baseruby.bat
@@ -1,6 +1,6 @@
 : "
 @echo off
 : "
-echo executable host ruby is required.  use --with-baseruby option.
-echo Note that BASERUBY must be Ruby 2.7.0 or later.
+echo>&2 executable host ruby is required.  use --with-baseruby option.
+echo>&2 Note that BASERUBY must be Ruby 2.7.0 or later.
 exit 1