diff --git a/urweb.rb b/urweb.rb
index 07178c3..f3fff25 100644
--- a/urweb.rb
+++ b/urweb.rb
@@ -7,8 +7,8 @@ class Urweb < Formula
   depends_on "autoconf" => :build
   depends_on "automake" => :build
   depends_on "libtool" => :build
-  depends_on "openssl" => :build
-  depends_on "mlton"
+  depends_on "openssl"
+  depends_on "mlton" => :build
   depends_on :postgresql => :optional
   depends_on :mysql => :optional