diff --git a/db/migrate/20200912190210_update_weight_calculators.rb b/db/migrate/20200912190210_update_weight_calculators.rb
index 4ee5a0dfc0..bf027fd257 100644
--- a/db/migrate/20200912190210_update_weight_calculators.rb
+++ b/db/migrate/20200912190210_update_weight_calculators.rb
@@ -1,6 +1,6 @@
 class UpdateWeightCalculators < ActiveRecord::Migration
   def change
-    Calculator::Weight.each { |calculator|
+    Calculator::Weight.all.each { |calculator|
       calculator.preferred_unit_from_list = 'kg'
       calculator.preferred_per_unit = calculator.preferred_per_kg
       calculator.preferences.delete(:preferred_per_kg)