diff --git a/app/models/harvest.rb b/app/models/harvest.rb
index 3afaeb170..1347c9f18 100644
--- a/app/models/harvest.rb
+++ b/app/models/harvest.rb
@@ -38,7 +38,8 @@ class Harvest < ActiveRecord::Base
 
   WEIGHT_UNITS_VALUES = {
     "kg" => "kg",
-    "lb" => "lb"
+    "lb" => "lb",
+    "oz" => "oz"
   }
   validates :weight_unit, :inclusion => { :in => WEIGHT_UNITS_VALUES.values,
     :message => "%{value} is not a valid unit" },