diff --git a/devsite/devsite/seed.py b/devsite/devsite/seed.py
index 3b386021..a70daf33 100644
--- a/devsite/devsite/seed.py
+++ b/devsite/devsite/seed.py
@@ -325,7 +325,7 @@ def wipe():
     CourseOverview.objects.all().delete()
     CourseDailyMetrics.objects.all().delete()
     SiteDailyMetrics.objects.all().delete()
-    LearnerCourseGradeMetrics.all().delete()
+    LearnerCourseGradeMetrics.objects.all().delete()
 
 
 def seed_all():