diff --git a/Formula/monetdb.rb b/Formula/monetdb.rb
index 3047fdbf133..86350501672 100644
--- a/Formula/monetdb.rb
+++ b/Formula/monetdb.rb
@@ -7,6 +7,7 @@ class Monetdb < Formula
 
   head 'http://dev.monetdb.org/hg/MonetDB', :using => :hg
 
+  depends_on 'pkg-config' => :build
   depends_on 'pcre'
   depends_on 'readline' # Compilation fails with libedit.