diff --git a/gtk-vnc.rb b/gtk-vnc.rb
index 07df3dd..170b5ec 100644
--- a/gtk-vnc.rb
+++ b/gtk-vnc.rb
@@ -5,6 +5,7 @@ class GtkVnc < Formula
 
   depends_on "pkg-config" => :build
   depends_on "intltool" => :build
+  depends_on "libtool" => :build
   #depends_on "vala" => :build
   depends_on "gobject-introspection" => :build