diff --git a/actions/finishopenidlogin.php b/actions/finishopenidlogin.php
index ff0b35218f..ba1e933e3e 100644
--- a/actions/finishopenidlogin.php
+++ b/actions/finishopenidlogin.php
@@ -217,7 +217,7 @@ class FinishopenidloginAction extends Action
 
         if (!Validate::string($nickname, array('min_length' => 1,
                                                'max_length' => 64,
-                                               'format' => VALIDATE_NUM . VALIDATE_ALPHA_LOWER))) {
+                                               'format' => NICKNAME_FMT))) {
             $this->showForm(_('Nickname must have only lowercase letters and numbers and no spaces.'));
             return;
         }
@@ -389,7 +389,7 @@ class FinishopenidloginAction extends Action
     {
         if (!Validate::string($str, array('min_length' => 1,
                                           'max_length' => 64,
-                                          'format' => VALIDATE_NUM . VALIDATE_ALPHA_LOWER))) {
+                                          'format' => NICKNAME_FMT))) {
             return false;
         }
         if (!User::allowed_nickname($str)) {
diff --git a/actions/profilesettings.php b/actions/profilesettings.php
index fb847680b9..d8fb2c9bb1 100644
--- a/actions/profilesettings.php
+++ b/actions/profilesettings.php
@@ -189,7 +189,7 @@ class ProfilesettingsAction extends AccountSettingsAction
             // Some validation
             if (!Validate::string($nickname, array('min_length' => 1,
                             'max_length' => 64,
-                            'format' => VALIDATE_NUM . VALIDATE_ALPHA_LOWER))) {
+                            'format' => NICKNAME_FMT))) {
                 $this->showForm(_('Nickname must have only lowercase letters and numbers and no spaces.'));
                 return;
             } else if (!User::allowed_nickname($nickname)) {
diff --git a/actions/updateprofile.php b/actions/updateprofile.php
index d8b62fb090..f6cb277aa7 100644
--- a/actions/updateprofile.php
+++ b/actions/updateprofile.php
@@ -79,7 +79,7 @@ class UpdateprofileAction extends Action
         $nickname = $req->get_parameter('omb_listenee_nickname');
         if ($nickname && !Validate::string($nickname, array('min_length' => 1,
                                                             'max_length' => 64,
-                                                            'format' => VALIDATE_NUM . VALIDATE_ALPHA_LOWER))) {
+                                                            'format' => NICKNAME_FMT))) {
             $this->clientError(_('Nickname must have only lowercase letters and numbers and no spaces.'));
             return false;
         }
diff --git a/actions/userauthorization.php b/actions/userauthorization.php
index 8dc2c808d6..00903ae01a 100644
--- a/actions/userauthorization.php
+++ b/actions/userauthorization.php
@@ -481,7 +481,7 @@ class UserauthorizationAction extends Action
         $nickname = $_GET['omb_listenee_nickname'];
         if (!Validate::string($nickname, array('min_length' => 1,
                                                'max_length' => 64,
-                                               'format' => VALIDATE_NUM . VALIDATE_ALPHA_LOWER))) {
+                                               'format' => NICKNAME_FMT))) {
             throw new OAuthException('Nickname must have only letters and numbers and no spaces.');
         }
         $profile = $_GET['omb_listenee_profile'];
diff --git a/plugins/FBConnect/FBConnectAuth.php b/plugins/FBConnect/FBConnectAuth.php
index 3cf9fefc13..a3e2cdadcd 100644
--- a/plugins/FBConnect/FBConnectAuth.php
+++ b/plugins/FBConnect/FBConnectAuth.php
@@ -238,7 +238,7 @@ class FBConnectauthAction extends Action
 
         if (!Validate::string($nickname, array('min_length' => 1,
                                                'max_length' => 64,
-                                               'format' => VALIDATE_NUM . VALIDATE_ALPHA_LOWER))) {
+                                               'format' => NICKNAME_FMT))) {
             $this->showForm(_('Nickname must have only lowercase letters and numbers and no spaces.'));
             return;
         }
@@ -418,7 +418,7 @@ class FBConnectauthAction extends Action
     {
         if (!Validate::string($str, array('min_length' => 1,
                                           'max_length' => 64,
-                                          'format' => VALIDATE_NUM . VALIDATE_ALPHA_LOWER))) {
+                                          'format' => NICKNAME_FMT))) {
             return false;
         }
         if (!User::allowed_nickname($str)) {