diff --git a/app/code/Magento/Robots/Controller/Index/Index.php b/app/code/Magento/Robots/Controller/Index/Index.php
index b94626e93432d..679066d723dce 100644
--- a/app/code/Magento/Robots/Controller/Index/Index.php
+++ b/app/code/Magento/Robots/Controller/Index/Index.php
@@ -43,6 +43,7 @@ public function execute()
         /** @var Page $resultPage */
         $resultPage = $this->resultPageFactory->create(true);
         $resultPage->addHandle('robots_index_index');
+        $resultPage->setHeader('Content-Type', 'text/plain');
         return $resultPage;
     }
 }
diff --git a/app/code/Magento/Robots/Test/Unit/Controller/Index/IndexTest.php b/app/code/Magento/Robots/Test/Unit/Controller/Index/IndexTest.php
index 22a69cc13bd52..d3a7a97c7ea80 100644
--- a/app/code/Magento/Robots/Test/Unit/Controller/Index/IndexTest.php
+++ b/app/code/Magento/Robots/Test/Unit/Controller/Index/IndexTest.php
@@ -51,6 +51,9 @@ public function testExecute()
         $resultPageMock->expects($this->once())
             ->method('addHandle')
             ->with('robots_index_index');
+        $resultPageMock->expects($this->once())
+            ->method('setHeader')
+            ->with('Content-Type', 'text/plain');
 
         $this->resultPageFactory->expects($this->any())
             ->method('create')