diff --git a/tasks/configuration.yml b/tasks/configuration.yml
index 7f2e6fa..5fc689a 100644
--- a/tasks/configuration.yml
+++ b/tasks/configuration.yml
@@ -3,7 +3,7 @@
 
 - name: Construire la liste des règles
   ansible.builtin.set_fact:
-    nftables_rules: "{{ nftables_rules + specific }}"
+    nftables_rules: "{{ (nftables_rules + specific) | unique }}"
   when: specific | length > 0
   loop: "{{ lookup('ansible.builtin.varnames', '^nftables_rules_.+', wantlist=True) }}"
   vars:
@@ -11,7 +11,7 @@
 
 - name: Construire la liste des tables
   ansible.builtin.set_fact:
-    nftables_tables: "{{ nftables_tables + specific }}"
+    nftables_tables: "{{ (nftables_tables + specific) | unique }}"
   when: specific | length > 0
   loop: "{{ lookup('ansible.builtin.varnames', '^nftables_tables_.+', wantlist=True) }}"
   vars: