diff --git a/app/assets/javascripts/admin/bulk_product_update.js.coffee b/app/assets/javascripts/admin/bulk_product_update.js.coffee
index 49b3333d65..da7f5af956 100644
--- a/app/assets/javascripts/admin/bulk_product_update.js.coffee
+++ b/app/assets/javascripts/admin/bulk_product_update.js.coffee
@@ -315,7 +315,7 @@ productsApp.controller "AdminBulkProductsCtrl", [
     $scope.productsWithoutDerivedAttributes = (products) ->
       products_filtered = []
       if products
-        products_filtered.push angular.extend {}, product for product in products
+        products_filtered = $scope.deepCopyProducts products
         for product in products_filtered
           delete product.variant_unit_with_scale
           if product.variants
@@ -326,6 +326,14 @@ productsApp.controller "AdminBulkProductsCtrl", [
       products_filtered
 
 
+    $scope.deepCopyProducts = (products) ->
+      copied_products = (angular.extend {}, product for product in products)
+      for product in copied_products
+        if product.variants
+          product.variants = (angular.extend {}, variant for variant in product.variants)
+      copied_products
+
+
     $scope.findProduct = (id) ->
       products = (product for product in $scope.products when product.id == id)
       if products.length == 0 then null else products[0]
diff --git a/spec/javascripts/unit/bulk_product_update_spec.js.coffee b/spec/javascripts/unit/bulk_product_update_spec.js.coffee
index 7b2b66fcef..f11262675f 100644
--- a/spec/javascripts/unit/bulk_product_update_spec.js.coffee
+++ b/spec/javascripts/unit/bulk_product_update_spec.js.coffee
@@ -707,9 +707,17 @@ describe "AdminBulkProductsCtrl", ->
       expect(scope.productsWithoutDerivedAttributes(scope.products)).toEqual([])
 
     it "does not alter original products", ->
-      scope.products = [{id: 123, variant_unit_with_scale: 'weight_1000'}]
-      scope.productsWithoutDerivedAttributes()
-      expect(scope.products).toEqual [{id: 123, variant_unit_with_scale: 'weight_1000'}]
+      scope.products = [{
+        id: 123
+        variant_unit_with_scale: 'weight_1000'
+        variants: [{options_text: 'foo'}]
+      }]
+      scope.productsWithoutDerivedAttributes(scope.products)
+      expect(scope.products).toEqual [{
+        id: 123
+        variant_unit_with_scale: 'weight_1000'
+        variants: [{options_text: 'foo'}]
+      }]
 
     describe "updating variants", ->
       it "returns variants without the unit_value_with_description field", ->
@@ -722,6 +730,19 @@ describe "AdminBulkProductsCtrl", ->
         ]
 
 
+  describe "deep copying products", ->
+    it "copies products", ->
+      product = {id: 123}
+      copiedProducts = scope.deepCopyProducts [product]
+      expect(copiedProducts[0]).not.toBe(product)
+
+    it "copies variants", ->
+      variant = {id: 1}
+      product = {id: 123, variants: [variant]}
+      copiedProducts = scope.deepCopyProducts [product]
+      expect(copiedProducts[0].variants[0]).not.toBe(variant)
+
+
   describe "fetching a product by id", ->
     it "returns the product when it is present", ->
       product = {id: 123}