diff --git a/postgresql/tasks/packages_buster.yml b/postgresql/tasks/packages_buster.yml
index 4b2e9efc..3a1a440e 100644
--- a/postgresql/tasks/packages_buster.yml
+++ b/postgresql/tasks/packages_buster.yml
@@ -3,7 +3,7 @@
 - name: "Set variables (Debian 10)"
   set_fact:
     postgresql_version: '11'
-  when: postgresql_version = ''
+  when: postgresql_version == ""
 
 - include: pgdg-repo.yml
   when: postgresql_version != '11'