diff --git a/core/lib/Drupal/Core/Routing/RouteProvider.php b/core/lib/Drupal/Core/Routing/RouteProvider.php
index 53ed626..10edb25 100644
--- a/core/lib/Drupal/Core/Routing/RouteProvider.php
+++ b/core/lib/Drupal/Core/Routing/RouteProvider.php
@@ -144,7 +144,7 @@ public function __construct(Connection $connection, StateInterface $state, Curre
   public function getRouteCollectionForRequest(Request $request) {
     // Cache both the system path as well as route parameters and matching
     // routes.
-    $cid = 'route:' . $request->getPathInfo() . ':' . $request->getQueryString();
+    $cid = 'route:' . $request->getHost() . ':' . $request->getPathInfo() . ':' . $request->getQueryString();
     if ($cached = $this->cache->get($cid)) {
       $this->currentPath->setPath($cached->data['path'], $request);
       $request->query->replace($cached->data['query']);
diff --git a/core/tests/Drupal/KernelTests/Core/Routing/RouteProviderTest.php b/core/tests/Drupal/KernelTests/Core/Routing/RouteProviderTest.php
index fa135f0..40892d3 100644
--- a/core/tests/Drupal/KernelTests/Core/Routing/RouteProviderTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Routing/RouteProviderTest.php
@@ -457,7 +457,7 @@ public function testRouteCaching() {
     $request = Request::create($path, 'GET');
     $provider->getRouteCollectionForRequest($request);
 
-    $cache = $this->cache->get('route:/path/add/one:');
+    $cache = $this->cache->get('route:' . $request->getHost() . ':/path/add/one:');
     $this->assertEqual('/path/add/one', $cache->data['path']);
     $this->assertEqual([], $cache->data['query']);
     $this->assertEqual(3, count($cache->data['routes']));
@@ -467,7 +467,7 @@ public function testRouteCaching() {
     $request = Request::create($path, 'GET');
     $provider->getRouteCollectionForRequest($request);
 
-    $cache = $this->cache->get('route:/path/add/one:foo=bar');
+    $cache = $this->cache->get('route:' . $request->getHost() . ':/path/add/one:foo=bar');
     $this->assertEqual('/path/add/one', $cache->data['path']);
     $this->assertEqual(['foo' => 'bar'], $cache->data['query']);
     $this->assertEqual(3, count($cache->data['routes']));
@@ -477,7 +477,7 @@ public function testRouteCaching() {
     $request = Request::create($path, 'GET');
     $provider->getRouteCollectionForRequest($request);
 
-    $cache = $this->cache->get('route:/path/1/one:');
+    $cache = $this->cache->get('route:' . $request->getHost() . ':/path/1/one:');
     $this->assertEqual('/path/1/one', $cache->data['path']);
     $this->assertEqual([], $cache->data['query']);
     $this->assertEqual(2, count($cache->data['routes']));
@@ -494,7 +494,7 @@ public function testRouteCaching() {
     $request = Request::create($path, 'GET');
     $provider->getRouteCollectionForRequest($request);
 
-    $cache = $this->cache->get('route:/path/add-one:');
+    $cache = $this->cache->get('route:' . $request->getHost() . ':/path/add-one:');
     $this->assertEqual('/path/add/one', $cache->data['path']);
     $this->assertEqual([], $cache->data['query']);
     $this->assertEqual(3, count($cache->data['routes']));