diff --git a/tool/make-snapshot b/tool/make-snapshot
index a12c141f5f..11b9b22207 100755
--- a/tool/make-snapshot
+++ b/tool/make-snapshot
@@ -266,6 +266,8 @@ def package(rev, destdir)
                MINIRUBY=#{miniruby}
                RUNRUBY=#{miniruby}
                RUBY=#{ENV["RUBY"]}
+               HAVE_BASERUBY=yes
+               BASERUBY=#{ENV["BASERUBY"]}
                prereq]
       IO.popen(cmd, "w") do |f|
         f.puts mk