diff --git a/advlabdb/models.py b/advlabdb/models.py
index 67bdd0a..d076e2a 100644
--- a/advlabdb/models.py
+++ b/advlabdb/models.py
@@ -241,7 +241,7 @@ class GroupExperiment(db.Model):
 
     def update_experiment_marks_missing(self):
         for experiment_mark in self.experiment_marks:
-            if experiment_mark.final_part_mark is None:
+            if experiment_mark.final_experiment_mark is None:
                 self.experiment_marks_missing = False
                 return