diff --git a/tasks/install.yml b/tasks/install.yml
index 53ca131..d902e5b 100644
--- a/tasks/install.yml
+++ b/tasks/install.yml
@@ -10,7 +10,7 @@
     - name: Install dependencies
       pip:
         name: "{{ item }}"
-        extra-args: --user
+        extra_args: --user
         state: latest
       loop: "{{ certbot_packages_extra }}"