diff --git a/lib/ansible/modules/extras/web_infrastructure/letsencrypt.py b/lib/ansible/modules/extras/web_infrastructure/letsencrypt.py
index e35b0e37aa1..6772b524fb8 100644
--- a/lib/ansible/modules/extras/web_infrastructure/letsencrypt.py
+++ b/lib/ansible/modules/extras/web_infrastructure/letsencrypt.py
@@ -49,6 +49,7 @@ description:
       protocol."
 requirements:
   - "python >= 2.6"
+  - openssl
 options:
   account_key:
     description: