diff --git a/vendor/symposion/conference/models.py b/vendor/symposion/conference/models.py
index 14e5ad3f2bb2819368f2f68ccfe70565d50b0f6d..3d4166b5cd680cd05f9ed996cec28f862139dac9 100644
--- a/vendor/symposion/conference/models.py
+++ b/vendor/symposion/conference/models.py
@@ -49,7 +49,11 @@ class Section(models.Model):
     scheduling process.
     """
 
-    conference = models.ForeignKey(Conference, verbose_name=_("Conference"))
+    conference = models.ForeignKey(
+        Conference,
+        verbose_name=_("Conference"),
+        on_delete=models.CASCADE,
+    )
 
     name = models.CharField(_("Name"), max_length=100)
     slug = models.SlugField(verbose_name=_("Slug"))