diff --git a/src/cambridge/cambridge.make b/src/cambridge/cambridge.make
index ad401af628d23afb75acafa11b594fe85a73882f..089de95865afa2dc099df8d86ff49d5d9680ea90 100644
--- a/src/cambridge/cambridge.make
+++ b/src/cambridge/cambridge.make
@@ -34,6 +34,7 @@ projects[realname] = "1.1"
 projects[redirect][version] = "1.0-rc1"
 projects[redirect][subdir] = "patched"
 projects[redirect][patch][] = "https://drupal.org/files/redirect-prevent_circular_redirects-1817976-42.patch"
+projects[rules] = "2.5"
 projects[transliteration] = "3.1"
 projects[varnish][version] = "1.0-beta2"
 projects[varnish][subdir] = "patched"