diff --git a/src/Support/Str.php b/src/Support/Str.php
index 010b8f3d..edcf7a23 100644
--- a/src/Support/Str.php
+++ b/src/Support/Str.php
@@ -218,6 +218,6 @@ public static function letterPlusNumber(string $letter, int $number) : string
      */
     public static function cleanup(string $string) : string
     {
-        return preg_replace("/[^a-zA-Z0-9\s]/", '', $string);
+        return preg_replace("/[^a-zA-Z0-9_\s]/", '', $string);
     }
 }