diff --git a/aleksis/apps/chronos/models.py b/aleksis/apps/chronos/models.py
index d5d772a179adea2734344eef3811fd047de51c7f..4570cc1951fa9eacde8a41381b29f52dfdf2b6bd 100644
--- a/aleksis/apps/chronos/models.py
+++ b/aleksis/apps/chronos/models.py
@@ -652,8 +652,9 @@ class Event(ExtensibleModel):
     date_start = models.DateField(verbose_name=_("Effective start date of event"), null=True)
     date_end = models.DateField(verbose_name=_("Effective end date of event"), null=True)
     absence_reason = models.ForeignKey("AbsenceReason", on_delete=models.CASCADE, related_name="absence_reason", verbose_name=_("Absence reason"))
-    periodfrom = models.ForeignKey("TimePeriod", on_delete=models.CASCADE, verbose_name=_("Effective start period of event"), related_name="+")
-    periodto = models.ForeignKey("TimePeriod", on_delete=models.CASCADE, verbose_name=_("Effective end period of event"), related_name="+")
+    period_from = models.ForeignKey("TimePeriod", on_delete=models.CASCADE, verbose_name=_("Effective start period of event"), related_name="+")
+    period_to = models.ForeignKey("TimePeriod", on_delete=models.CASCADE, verbose_name=_("Effective end period of event"), related_name="+")
+
     groups = models.ManyToManyField("core.Group", related_name="events", verbose_name=_("Groups"))
     rooms = models.ManyToManyField("Room", related_name="events", verbose_name=_("Rooms"))
     teachers = models.ManyToManyField("core.Person", related_name="events", verbose_name=_("Teachers"))