diff --git a/common/djangoapps/entitlements/admin.py b/common/djangoapps/entitlements/admin.py
index 1d2dbb6dbe..9e3530df7c 100644
--- a/common/djangoapps/entitlements/admin.py
+++ b/common/djangoapps/entitlements/admin.py
@@ -23,6 +23,7 @@ class CourseEntitlementAdmin(admin.ModelAdmin):
                     'enrollment_course_run',
                     'order_number')
     raw_id_fields = ('enrollment_course_run', 'user',)
+    readonly_fields = ['order_number']
     search_fields = ('user__username', 'uuid', 'course_uuid', 'mode', 'order_number')