diff --git a/tin/apps/submissions/models.py b/tin/apps/submissions/models.py
index 42649b74..513a9350 100644
--- a/tin/apps/submissions/models.py
+++ b/tin/apps/submissions/models.py
@@ -133,7 +133,7 @@ def points_possible(self):
 
     @property
     def point_override(self):
-        return sum(c.point_override for c in self.comments.all())
+        return sum(c.point_override for c in self.comments.all() if c.point_override)
 
     @property
     def points(self):