diff --git a/app/code/Magento/ConfigurableProduct/Model/Product/Type/Configurable.php b/app/code/Magento/ConfigurableProduct/Model/Product/Type/Configurable.php
index 36981aafc34e2..fa677b0b8b421 100644
--- a/app/code/Magento/ConfigurableProduct/Model/Product/Type/Configurable.php
+++ b/app/code/Magento/ConfigurableProduct/Model/Product/Type/Configurable.php
@@ -592,7 +592,7 @@ protected function getGalleryReadHandler()
      * @param  \Magento\Catalog\Model\Product $product
      * @return \Magento\ConfigurableProduct\Model\ResourceModel\Product\Type\Configurable\Product\Collection
      */
-    public function getLinkedProductCollection($product)
+    protected function getLinkedProductCollection($product)
     {
         $collection = $this->_productCollectionFactory->create()->setFlag(
             'product_children',
@@ -767,8 +767,9 @@ public function isSalable($product)
             $storeId = $storeId->getId();
         }
 
-        if (isset($this->isSaleableBySku[$storeId][$product->getSku()])) {
-            return $this->isSaleableBySku[$storeId][$product->getSku()];
+        $sku = $product->getSku();
+        if (isset($this->isSaleableBySku[$storeId][$sku])) {
+            return $this->isSaleableBySku[$storeId][$sku];
         }
 
         $salable = parent::isSalable($product);
@@ -780,7 +781,7 @@ public function isSalable($product)
             $salable = 0 !== $collection->getSize();
         }
 
-        $this->isSaleableBySku[$storeId][$product->getSku()] = $salable;
+        $this->isSaleableBySku[$storeId][$sku] = $salable;
 
         return $salable;
     }
diff --git a/app/code/Magento/ConfigurableProduct/Test/Unit/Model/Product/Type/ConfigurableTest.php b/app/code/Magento/ConfigurableProduct/Test/Unit/Model/Product/Type/ConfigurableTest.php
index 165e479d99348..603b5b4c90f46 100644
--- a/app/code/Magento/ConfigurableProduct/Test/Unit/Model/Product/Type/ConfigurableTest.php
+++ b/app/code/Magento/ConfigurableProduct/Test/Unit/Model/Product/Type/ConfigurableTest.php
@@ -567,12 +567,18 @@ public function testHasOptionsFalse()
     public function testIsSalable()
     {
         $productMock = $this->getMockBuilder(\Magento\Catalog\Model\Product::class)
-            ->setMethods(['__wakeup', 'getStatus', 'hasData', 'getData', 'getStoreId', 'setData'])
+            ->setMethods(['__wakeup', 'getStatus', 'hasData', 'getData', 'getStoreId', 'setData', 'getSku'])
             ->disableOriginalConstructor()
             ->getMock();
+        $productMock
+            ->expects($this->at(0))
+            ->method('getData')
+            ->with('_cache_instance_store_filter')
+            ->willReturn(0);
         $productMock->expects($this->once())->method('getStatus')->willReturn(1);
         $productMock->expects($this->any())->method('hasData')->willReturn(true);
-        $productMock->expects($this->at(2))->method('getData')->with('is_salable')->willReturn(true);
+        $productMock->expects($this->at(1))->method('getSku')->willReturn('SKU-CODE');
+        $productMock->expects($this->at(4))->method('getData')->with('is_salable')->willReturn(true);
         $productCollection = $this->getMockBuilder(
             \Magento\ConfigurableProduct\Model\ResourceModel\Product\Type\Configurable\Product\Collection::class
         )