diff --git a/advlabdb/custom_classes.py b/advlabdb/custom_classes.py
index abc663c..a5d333e 100644
--- a/advlabdb/custom_classes.py
+++ b/advlabdb/custom_classes.py
@@ -64,7 +64,8 @@ class SecureAssistantIndexView(CustomIndexView):
     @expose("/")
     def index(self):
         number_of_missing_final_experiment_marks = db.session.scalar(
-            select(func.count(ExperimentMark.final_experiment_mark))
+            select(func.count())
+            .select_from(ExperimentMark)
             .join(GroupExperiment)
             .join(SemesterExperiment)
             .where(SemesterExperiment.semester == current_user.active_semester)