diff --git a/Formula/rasqal.rb b/Formula/rasqal.rb
index 6f30ab5498..a91a6dc04f 100644
--- a/Formula/rasqal.rb
+++ b/Formula/rasqal.rb
@@ -5,6 +5,7 @@ class Rasqal < Formula
   url 'http://download.librdf.org/source/rasqal-0.9.29.tar.gz'
   sha1 'a005556bf62d44a8fa1cc2faf931f78ed4516852'
 
+  depends_on 'pkg-config' => :build
   depends_on 'raptor'
 
   def install