diff --git a/db/migrate/20150602021020_add_score_to_work.rb b/db/migrate/20150602021020_add_score_to_work.rb
index 93045793c..446a5a4f7 100644
--- a/db/migrate/20150602021020_add_score_to_work.rb
+++ b/db/migrate/20150602021020_add_score_to_work.rb
@@ -2,8 +2,9 @@ class AddScoreToWork < ActiveRecord::Migration
   require 'bigdecimal'
 
   def up
+    count = StudentWork.all.count / 10 + 1
     transaction do
-      for i in 1 ... 1000 do i
+      for i in 1 ... count do i
         StudentWork.page(i).per(10).each do |work|
           teacher_score = work.student_works_scores.where(:reviewer_role => 1).order("created_at desc")
           unless teacher_score.empty?
@@ -43,8 +44,9 @@ class AddScoreToWork < ActiveRecord::Migration
   end
 
   def down
+    count = StudentWork.all.count / 10 + 1
     transaction do
-      for i in 1 ... 1000 do i
+      for i in 1 ... count do i
         StudentWork.page(i).per(10).each do |work|
           work.teacher_score = nil
           work.teaching_asistant_score = nil