diff --git a/ruhrpottmetaller/Data/LowLevel/String/RmString.php b/ruhrpottmetaller/Data/LowLevel/String/RmString.php
index be937da..4fdf0db 100644
--- a/ruhrpottmetaller/Data/LowLevel/String/RmString.php
+++ b/ruhrpottmetaller/Data/LowLevel/String/RmString.php
@@ -36,7 +36,7 @@ public function hasSpecialFirstChar(): bool
 
     public function filter(): RmString
     {
-        $this->value = htmlentities($this->value);
+        $this->value = htmlentities($this->value, ENT_QUOTES);
         return $this;
     }
 }