diff --git a/testsite/group_vars/all.yml b/testsite/group_vars/all.yml
index 452fbfdd3f024a72333fd880e8276c038fa714d9..d075af6de1d7dc015a1315f70e7175a21c8b6d2d 100644
--- a/testsite/group_vars/all.yml
+++ b/testsite/group_vars/all.yml
@@ -26,6 +26,7 @@ common_packages:
   - emacs24-nox
   - screen
   - debconf-utils
+  - colordiff
 
 ca_certificates:
   - "{{ inventory_dir }}/tls/example_ca_chain.pem"