diff --git a/cotisations/templates/cotisations/delete.html b/cotisations/templates/cotisations/delete.html
new file mode 100644
index 00000000..7873bd29
--- /dev/null
+++ b/cotisations/templates/cotisations/delete.html
@@ -0,0 +1,16 @@
+{% extends "machines/sidebar.html" %}
+{% load bootstrap3 %}
+
+{% block title %}Création et modification de machines{% endblock %}
+
+{% block content %}
+
+<form class="form" method="post">
+    {% csrf_token %}
+    <h4>Attention, voulez-vous vraiment supprimer cet objet {{ objet_name }} ( {{ objet }} ) ?</h4>
+    {% bootstrap_button "Confirmer" button_type="submit" icon="trash" %}
+</form>
+  <br />
+  <br />
+  <br />
+{% endblock %}
diff --git a/cotisations/views.py b/cotisations/views.py
index 6cc533c6..2975e97e 100644
--- a/cotisations/views.py
+++ b/cotisations/views.py
@@ -147,9 +147,11 @@ def del_facture(request, factureid):
     if (facture.control or not facture.valid):
         messages.error(request, "Vous ne pouvez pas editer une facture controlée ou invalidée par le trésorier")
         return redirect("/cotisations/")
-    facture.delete()
-    messages.success(request, "La facture a bien été supprimée")
-    return redirect("/cotisations/")
+    if request.method == "POST":
+        facture.delete()
+        messages.success(request, "La facture a été détruite")
+        return redirect("/cotisations/")
+    return form({'objet': facture, 'objet_name': 'facture'}, 'cotisations/delete.html', request)
 
 @login_required
 @permission_required('trésorier')
diff --git a/machines/migrations/0019_auto_20160718_1141.py b/machines/migrations/0019_auto_20160718_1141.py
new file mode 100644
index 00000000..bd99efb6
--- /dev/null
+++ b/machines/migrations/0019_auto_20160718_1141.py
@@ -0,0 +1,19 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('machines', '0018_auto_20160708_1813'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='interface',
+            name='machine',
+            field=models.ForeignKey(to='machines.Machine'),
+        ),
+    ]
diff --git a/machines/templates/machines/delete.html b/machines/templates/machines/delete.html
new file mode 100644
index 00000000..7873bd29
--- /dev/null
+++ b/machines/templates/machines/delete.html
@@ -0,0 +1,16 @@
+{% extends "machines/sidebar.html" %}
+{% load bootstrap3 %}
+
+{% block title %}Création et modification de machines{% endblock %}
+
+{% block content %}
+
+<form class="form" method="post">
+    {% csrf_token %}
+    <h4>Attention, voulez-vous vraiment supprimer cet objet {{ objet_name }} ( {{ objet }} ) ?</h4>
+    {% bootstrap_button "Confirmer" button_type="submit" icon="trash" %}
+</form>
+  <br />
+  <br />
+  <br />
+{% endblock %}
diff --git a/machines/views.py b/machines/views.py
index a8989a46..1dcbf309 100644
--- a/machines/views.py
+++ b/machines/views.py
@@ -135,9 +135,11 @@ def del_machine(request, machineid):
         if machine.user != request.user:
             messages.error(request, "Vous ne pouvez pas éditer une machine d'un autre user que vous sans droit")
             return redirect("/users/profil/" + str(request.user.id))
-    machine.delete()
-    messages.success(request, "La machine a été détruite")
-    return redirect("/users/profil/" + str(request.user.id))
+    if request.method == "POST":
+        machine.delete()
+        messages.success(request, "La machine a été détruite")
+        return redirect("/users/profil/" + str(request.user.id))
+    return form({'objet': machine, 'objet_name': 'machine'}, 'machines/delete.html', request)
 
 @login_required
 def new_interface(request, machineid):
@@ -175,9 +177,11 @@ def del_interface(request, interfaceid):
         if interface.machine.user != request.user:
             messages.error(request, "Vous ne pouvez pas éditer une machine d'un autre user que vous sans droit")
             return redirect("/users/profil/" + str(request.user.id))
-    interface.delete()
-    messages.success(request, "L'interface a été détruite")
-    return redirect("/users/profil/" + str(request.user.id))
+    if request.method == "POST":
+        interface.delete()
+        messages.success(request, "L'interface a été détruite")
+        return redirect("/users/profil/" + str(request.user.id))
+    return form({'objet': interface, 'objet_name': 'interface'}, 'machines/delete.html', request)
 
 @login_required
 @permission_required('infra')
diff --git a/topologie/migrations/0017_auto_20160718_1141.py b/topologie/migrations/0017_auto_20160718_1141.py
new file mode 100644
index 00000000..6fdc0b6b
--- /dev/null
+++ b/topologie/migrations/0017_auto_20160718_1141.py
@@ -0,0 +1,20 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('topologie', '0016_auto_20160706_1531'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='port',
+            name='machine_interface',
+            field=models.OneToOneField(to='machines.Interface', on_delete=django.db.models.deletion.SET_NULL, null=True, blank=True),
+        ),
+    ]
diff --git a/topologie/models.py b/topologie/models.py
index 717d15ea..8eba55a3 100644
--- a/topologie/models.py
+++ b/topologie/models.py
@@ -29,7 +29,7 @@ class Port(models.Model):
     switch = models.ForeignKey('Switch', related_name="ports")
     port = models.IntegerField()
     room = models.ForeignKey('Room', on_delete=models.PROTECT, blank=True, null=True)
-    machine_interface = models.OneToOneField('machines.Interface', on_delete=models.PROTECT, blank=True, null=True)
+    machine_interface = models.OneToOneField('machines.Interface', on_delete=models.SET_NULL, blank=True, null=True)
     related = models.OneToOneField('self', null=True, blank=True, related_name='related_port')
     details = models.CharField(max_length=255, blank=True)