diff --git a/libraries/vendor/joomla/filter/src/InputFilter.php b/libraries/vendor/joomla/filter/src/InputFilter.php
index 3dccca490b728..1a17f5204b549 100644
--- a/libraries/vendor/joomla/filter/src/InputFilter.php
+++ b/libraries/vendor/joomla/filter/src/InputFilter.php
@@ -864,7 +864,7 @@ protected function cleanAttributes($attrSet)
 			}
 
 			// Remove all symbols
-			$attrSubSet[0] = preg_replace('/[^\p{L}\p{N}\s]/u', '', $attrSubSet[0]);
+			$attrSubSet[0] = preg_replace('/[^\p{L}\p{N}\-\s]/u', '', $attrSubSet[0]);
 
 			// Remove all "non-regular" attribute names
 			// AND blacklisted attributes