diff --git a/physics/admin.py b/physics/admin.py
index 1fd2af27..94c64032 100644
--- a/physics/admin.py
+++ b/physics/admin.py
@@ -22,7 +22,7 @@ class QuestionAdmin(VersionAdmin):
     #("b", "b_answer"),
     #)
 
-class ExamAdmin(VersionAdmin):
+class ExamAdmin(VersionAdmin, admin.ModelAdmin):
     save_as = True
 
 admin.site.register(Category)