diff --git a/core/app/models/spree/product.rb b/core/app/models/spree/product.rb
index a5123dc70bc..1b9cf3e6b92 100644
--- a/core/app/models/spree/product.rb
+++ b/core/app/models/spree/product.rb
@@ -25,7 +25,7 @@ class Product < Spree::Base
       variants_including_master.discard_all
       self.product_option_types = []
       self.product_properties = []
-      self.classifications = []
+      self.classifications.destroy_all
       self.product_promotion_rules = []
     end
 
diff --git a/core/spec/models/spree/classification_spec.rb b/core/spec/models/spree/classification_spec.rb
index 9af2e00cb93..5013653766a 100644
--- a/core/spec/models/spree/classification_spec.rb
+++ b/core/spec/models/spree/classification_spec.rb
@@ -44,6 +44,18 @@ def positions_to_be_valid(taxon)
       end
     end
 
+    context "Discard'ing a product" do
+      before :each do
+        element = taxon_with_5_products.products[1]
+        expect(element.classifications.first.position).to eq(2)
+        element.discard
+      end
+
+      it "resets positions" do
+        expect positions_to_be_valid(taxon_with_5_products)
+      end
+    end
+
     context "replacing taxon's products" do
       before :each do
         products = taxon_with_5_products.products.to_a