diff --git a/users.php b/users.php
index 53b40c6..178ed1a 100644
--- a/users.php
+++ b/users.php
@@ -72,7 +72,7 @@ class users
       throw new Exception (dgettext("domframework", 
                                     "Invalid email provided : too short"),
                            500);
-    if (strpos ($lastname, ":") !== false)
+    if (strpos ($email, ":") !== false)
       throw new Exception (dgettext("domframework", 
                                 "Invalid email provided : colon forbidden"),
                            500);