diff --git a/mod/wiki/admin.php b/mod/wiki/admin.php
index 9a9dbc0113d..a2abceb86ae 100644
--- a/mod/wiki/admin.php
+++ b/mod/wiki/admin.php
@@ -77,7 +77,7 @@
 
     # Check for dangerous events (hacking) !
     if(in_array($action,array("removepages","strippages","revertpages"))) {
-      if($wiki->wtype!="student" && !isteacher($course->id)) {
+      if(!($wiki->wtype=="student" || isteacher($course->id))) {
         error("Hack attack detected !");
       }          
     }