diff --git a/db/seeds/templates/units.erb b/db/seeds/templates/units.erb
index 719c059..f76e37a 100644
--- a/db/seeds/templates/units.erb
+++ b/db/seeds/templates/units.erb
@@ -1,5 +1,6 @@
 Unit.transaction do
   ActiveRecord::Base.connection.truncate(Unit.table_name)
+  units = {}
 <% Unit.defaults.ordered.each do |unit| %>
 <%= "\n" if unit.base.nil? %>
   units['<%= unit.symbol %>'] =
diff --git a/db/seeds/units.rb b/db/seeds/units.rb
index 261f196..60cbc03 100644
--- a/db/seeds/units.rb
+++ b/db/seeds/units.rb
@@ -1,5 +1,6 @@
 Unit.transaction do
   ActiveRecord::Base.connection.truncate(Unit.table_name)
+  units = {}
 
   units['1'] =
     Unit.create symbol: '1',