diff --git a/course/auth.py b/course/auth.py
index 4d1a4d8d1939dfe6b424c761822b45b1badcef05..83ba90d48811dc0006fff4cacb3992b3390528ce 100644
--- a/course/auth.py
+++ b/course/auth.py
@@ -83,10 +83,10 @@ def may_impersonate(impersonator, impersonee):
                 if perm == pperm.impersonate_role)
 
         if Participation.objects.filter(
-                participations__course=part.course,
-                participations__status=participation_status.active,
-                participations__role__in=impersonable_roles,
-                participations__user=impersonee).count():
+                course=part.course,
+                status=participation_status.active,
+                role__in=impersonable_roles,
+                user=impersonee).count():
             return True
 
     return False