diff --git a/app/models/spree/product.rb b/app/models/spree/product.rb
index 0f8eeab61c..697bb56030 100755
--- a/app/models/spree/product.rb
+++ b/app/models/spree/product.rb
@@ -96,6 +96,7 @@ module Spree
 
     validates :variant_unit, presence: true
     validates :unit_value, presence: true
+    validates :unit_value, numericality: true
     validates :variant_unit_scale,
               presence: { if: ->(p) { %w(weight volume).include? p.variant_unit } }
     validates :variant_unit_name,