diff --git a/src/KeyNormalizer.php b/src/KeyNormalizer.php
new file mode 100644
index 0000000..7507e47
--- /dev/null
+++ b/src/KeyNormalizer.php
@@ -0,0 +1,40 @@
+<?php
+
+/*
+ * This file is part of php-cache\cache-bundle package.
+ *
+ * (c) 2015-2015 Aaron Scherer <aequasi@gmail.com>, Tobias Nyholm <tobias.nyholm@gmail.com>
+ *
+ * This source file is subject to the MIT license that is bundled
+ * with this source code in the file LICENSE.
+ */
+
+namespace Cache\CacheBundle;
+
+/**
+ * A class to normalize cache keys.
+ *
+ * @author Tobias Nyholm <tobias.nyholm@gmail.com>
+ */
+class KeyNormalizer
+{
+    /**
+     * Remove all characters that is not supported by PSR6.
+     *
+     * @param $key
+     */
+    public static function onlyValid($key)
+    {
+        return preg_replace('|[^A-Za-z0-9_\.]|', '', $key);
+    }
+
+    /**
+     * Remove all characters that are marked as reserved in PSR6.
+     *
+     * @param string $key
+     */
+    public static function noInvalid($key)
+    {
+        return preg_replace('|[\{\}\(\)/\\\@\:]|', '', $key);
+    }
+}
diff --git a/src/Routing/CachingRouter.php b/src/Routing/CachingRouter.php
index 6a631a2..5124b1f 100644
--- a/src/Routing/CachingRouter.php
+++ b/src/Routing/CachingRouter.php
@@ -11,6 +11,7 @@
 
 namespace Cache\CacheBundle\Routing;
 
+use Cache\CacheBundle\KeyNormalizer;
 use Cache\Taggable\TaggableItemInterface;
 use Psr\Cache\CacheItemPoolInterface;
 use Symfony\Component\Routing\RequestContext;
@@ -125,7 +126,7 @@ private function getCacheItemMatch($pathinfo)
     {
         /** @type RequestContext $c */
         $c   = $this->getContext();
-        $key = sprintf('%s__%s__%s__%s', $c->getHost(), str_replace('/', '.', $pathinfo), $c->getMethod(), $c->getQueryString());
+        $key = sprintf('%s__%s__%s__%s', $c->getHost(), $pathinfo, $c->getMethod(), $c->getQueryString());
 
         return $this->getCacheItemFromKey($key, 'match');
     }
@@ -163,7 +164,7 @@ public function __call($method, $args)
      */
     private function getCacheItemFromKey($key, $tag)
     {
-        $item = $this->cache->getItem($key);
+        $item = $this->cache->getItem(KeyNormalizer::noInvalid($key));
 
         if ($item instanceof TaggableItemInterface) {
             $item->setTags(['router', $tag]);
diff --git a/tests/KeyNormalizerTest.php b/tests/KeyNormalizerTest.php
new file mode 100644
index 0000000..e6fd69f
--- /dev/null
+++ b/tests/KeyNormalizerTest.php
@@ -0,0 +1,31 @@
+<?php
+
+/*
+ * This file is part of php-cache\cache-bundle package.
+ *
+ * (c) 2015-2015 Aaron Scherer <aequasi@gmail.com>, Tobias Nyholm <tobias.nyholm@gmail.com>
+ *
+ * This source file is subject to the MIT license that is bundled
+ * with this source code in the file LICENSE.
+ */
+
+namespace Cache\CacheBundle\Tests;
+
+use Cache\CacheBundle\KeyNormalizer;
+
+class KeyNormalizerTest extends \PHPUnit_Framework_TestCase
+{
+    public function testOnlyValid()
+    {
+        $input    = '%foo!bar-';
+        $expected = 'foobar';
+        $this->assertEquals($expected, KeyNormalizer::onlyValid($input));
+    }
+
+    public function testNoInvalid()
+    {
+        $input    = '{foo@bar}';
+        $expected = 'foobar';
+        $this->assertEquals($expected, KeyNormalizer::noInvalid($input));
+    }
+}