diff --git a/src/Psr16/MemcachedEngine.php b/src/Psr16/MemcachedEngine.php
index 8e2ea56..75c6869 100644
--- a/src/Psr16/MemcachedEngine.php
+++ b/src/Psr16/MemcachedEngine.php
@@ -52,6 +52,7 @@ public function __construct(?array $servers = null, $logger = null, ?array $opti
     protected function fixKey(string $key): string
     {
         $key = $this->getKeyFromContainer($key);
+        $key = preg_replace('/[^A-Za-z0-9_\-]/', '-', $key);
         return "cache-" . $key;
     }