diff --git a/shiftregister/app/models.py b/shiftregister/app/models.py
index d1c9c3a..cfb3650 100644
--- a/shiftregister/app/models.py
+++ b/shiftregister/app/models.py
@@ -127,7 +127,7 @@ class ShiftRegistration(models.Model):
     )
 
     def can_cancel(self):
-        if self.state != self.REGISTERED:
+        if self.state != self.RegState.REGISTERED:
             return false
         return self.shift.start_at > (
             timezone.now()