diff --git a/roles/ruby/tasks/main.yml b/roles/ruby/tasks/main.yml
index 306b3af..012deaf 100644
--- a/roles/ruby/tasks/main.yml
+++ b/roles/ruby/tasks/main.yml
@@ -31,7 +31,7 @@
   become: true
   become_user: mastodon
 - name: Install Ruby and set it as the user's default
-  shell: rbenv install 2.4.2 && rbenv global 2.4.2
+  shell: /home/mastodon/.rbenv/bin/rbenv install 2.4.2 && /home/mastodon/.rbenv/bin/rbenv global 2.4.2
   args:
     executable: /bin/bash
   become: true