diff --git a/Formula/py2cairo.rb b/Formula/py2cairo.rb
index 94f76ff57f..eb6fd34873 100644
--- a/Formula/py2cairo.rb
+++ b/Formula/py2cairo.rb
@@ -5,6 +5,7 @@ class Py2cairo < Formula
   url 'http://cairographics.org/releases/py2cairo-1.10.0.tar.bz2'
   sha1 '2efa8dfafbd6b8e492adaab07231556fec52d6eb'
 
+  depends_on 'pkg-config' => :build
   depends_on 'cairo'
   depends_on :x11