diff --git a/include/acl_selectors.php b/include/acl_selectors.php
index 94f51a9ff5..9467531d9f 100644
--- a/include/acl_selectors.php
+++ b/include/acl_selectors.php
@@ -26,7 +26,7 @@ function group_select($selname,$selclass,$preselected = false,$size = 4) {
 				$selected = " selected=\"selected\" ";
 			else
 				$selected = '';
-			$trimmed = substr($rr['name'],0,12);
+			$trimmed = mb_substr($rr['name'],0,12);
 
 			$o .= "<option value=\"{$rr['id']}\" $selected title=\"{$rr['name']}\" >$trimmed</option>\r\n";
 		}
@@ -89,7 +89,7 @@ function contact_select($selname, $selclass, $preselected = false, $size = 4, $p
 			else
 				$selected = '';
 
-			$trimmed = substr($rr['name'],0,22);
+			$trimmed = mb_substr($rr['name'],0,22);
 
 			$o .= "<option value=\"{$rr['id']}\" $selected title=\"{$rr['name']}|{$rr['url']}\" >$trimmed</option>\r\n";
 		}