diff --git a/src/Cache/FileTagSet.php b/src/Cache/FileTagSet.php
index 61a1558..ac566b2 100644
--- a/src/Cache/FileTagSet.php
+++ b/src/Cache/FileTagSet.php
@@ -16,7 +16,7 @@ class FileTagSet extends TagSet{
 	 */
 	public function tagKey($name)
 	{
-		return 'cache_tags' . $this->store->separator .$name;
+		return 'cache_tags' . $this->store->separator . preg_replace('/[^\w\s\d\-_~,;\[\]\(\).]/', '~', $name);
 	}