diff --git a/admin/users.php b/admin/users.php
index 80a440ff99f..b0c3791e2bc 100644
--- a/admin/users.php
+++ b/admin/users.php
@@ -4,7 +4,7 @@
 
     require_login();
 
-    if (!isadmin) {
+    if (!isadmin()) {
         error("Only admins can access this page");
     }