diff --git a/phpgwapi/inc/class.egw_htmLawed.inc.php b/phpgwapi/inc/class.egw_htmLawed.inc.php
index d9c09f681f..ac9b20c09f 100644
--- a/phpgwapi/inc/class.egw_htmLawed.inc.php
+++ b/phpgwapi/inc/class.egw_htmLawed.inc.php
@@ -118,7 +118,7 @@ class egw_htmLawed
 function hl_my_tag_transform($element, $attribute_array=0)
 {
 	// If second argument is not received, it means a closing tag is being handled
-	if(ctype_digit($attribute_array)){
+	if(is_numeric($attribute_array)){
 		return "</$element>";
 	}
 
@@ -187,7 +187,7 @@ function hl_my_tag_transform($element, $attribute_array=0)
 function hl_email_tag_transform($element, $attribute_array=0)
 {
 	// If second argument is not received, it means a closing tag is being handled
-	if(ctype_digit($attribute_array)){
+	if(is_numeric($attribute_array)){
 		return "</$element>";
 	}