diff --git a/postgresql/tasks/packages_jessie.yml b/postgresql/tasks/packages_jessie.yml
index abf0ad08..3e21bc0e 100644
--- a/postgresql/tasks/packages_jessie.yml
+++ b/postgresql/tasks/packages_jessie.yml
@@ -1,5 +1,10 @@
 ---
 
+- name: "Set variables (Debian 8)"
+  set_fact:
+    postgresql_version: '9.4'
+  when: postgresql_version == ""
+
 - include: pgdg-repo.yml
   when: postgresql_version != '9.4'
 
diff --git a/postgresql/tasks/packages_stretch.yml b/postgresql/tasks/packages_stretch.yml
index d6a3aa5e..eff513f9 100644
--- a/postgresql/tasks/packages_stretch.yml
+++ b/postgresql/tasks/packages_stretch.yml
@@ -1,5 +1,10 @@
 ---
 
+- name: "Set variables (Debian 9)"
+  set_fact:
+    postgresql_version: '9.6'
+  when: postgresql_version == ""
+
 - include: pgdg-repo.yml
   when: postgresql_version != '9.6'