diff --git a/app/assets/javascripts/supplier/app/views/number_field.js.coffee b/app/assets/javascripts/supplier/app/views/number_field.js.coffee
index fd784ba4..c59a349b 100644
--- a/app/assets/javascripts/supplier/app/views/number_field.js.coffee
+++ b/app/assets/javascripts/supplier/app/views/number_field.js.coffee
@@ -1,3 +1,8 @@
 App.NumberField = Ember.TextField.extend
   type: 'number'
   attributeBindings: ['min', 'max', 'step']
+  numericValue: Ember.computed 'value', (key, value) ->
+    if arguments.length is 1
+      parseFloat @get "value"
+    else
+      @set "value", (if value isnt undefined then "#{value}" else "")