diff --git a/php/tasks/main.yml b/php/tasks/main.yml
index c0f736c4..86bde74f 100644
--- a/php/tasks/main.yml
+++ b/php/tasks/main.yml
@@ -2,7 +2,7 @@
 
 - assert:
     that:
-      - ansible_distribution != "Debian"
+      - ansible_distribution == "Debian"
       - ansible_distribution_major_version is version('8', '>=')
       - ansible_distribution_major_version is version('11', '<=')
     msg: This is only compatible with Debian 8 → 11