diff --git a/.fixtures.yml b/.fixtures.yml
index 84cca4fd9..49b129ffa 100644
--- a/.fixtures.yml
+++ b/.fixtures.yml
@@ -1,6 +1,8 @@
 fixtures:
   repositories:
-    'concat': 'git://github.com/puppetlabs/puppetlabs-concat.git'
+    'concat':
+      'repo': 'git://github.com/puppetlabs/puppetlabs-concat.git'
+      'ref': '1.2.1'
     'stdlib': 'git://github.com/puppetlabs/puppetlabs-stdlib.git'
     'inifile': 'git://github.com/puppetlabs/puppetlabs-inifile'
     'keystone': 'git://github.com/stackforge/puppet-keystone.git'