diff --git a/CONTRIBUTORS.txt b/CONTRIBUTORS.txt
index 8afa923..cffbfc2 100644
--- a/CONTRIBUTORS.txt
+++ b/CONTRIBUTORS.txt
@@ -49,6 +49,7 @@ In chronological order:
 
 * Nick Hu <https://github.com/NickHu>
   * Added configuration to require email addresses (no validation)
+  * Fix Vagrantfile
 
 * [Your name or handle] <[email or website]>
   * [Brief summary of your changes]
diff --git a/ansible/site.yml b/ansible/site.yml
index 4f974ac..7304364 100644
--- a/ansible/site.yml
+++ b/ansible/site.yml
@@ -32,6 +32,7 @@
         - supervisor
         - sqlite3
         - nodejs
+        - libffi-dev
 
     - name: NPM | Install packages
       npm: name={{ item }} global=yes