diff --git a/src/mibew/libs/classes/invitation_style.php b/src/mibew/libs/classes/invitation_style.php
index b9d9b3a6..a91cdf93 100644
--- a/src/mibew/libs/classes/invitation_style.php
+++ b/src/mibew/libs/classes/invitation_style.php
@@ -55,7 +55,7 @@ class InvitationStyle extends Style implements StyleInterface {
 	 */
 	public static function currentStyle() {
 		// Load value from system settings
-		return Settings::get('invitationstyle');
+		return Settings::get('invitation_style');
 	}
 
 	/**
@@ -64,7 +64,7 @@ class InvitationStyle extends Style implements StyleInterface {
 	 * @param string $style_name Name of a style
 	 */
 	public static function setCurrentStyle($style_name) {
-		Settings::set('invitationstyle', $style_name);
+		Settings::set('invitation_style', $style_name);
 		Settings::update();
 	}
 
diff --git a/src/mibew/libs/classes/settings.php b/src/mibew/libs/classes/settings.php
index 8b104128..95f39181 100644
--- a/src/mibew/libs/classes/settings.php
+++ b/src/mibew/libs/classes/settings.php
@@ -66,7 +66,7 @@ Class Settings {
 			'logo' => '',
 			'usernamepattern' => '{name}',
 			'chat_style' => 'default',
-			'invitationstyle' => 'default',
+			'invitation_style' => 'default',
 			'page_style' => 'default',
 			'chattitle' => 'Live Support',
 			'geolink' => 'http://api.hostip.info/get_html.php?ip={ip}',
diff --git a/src/mibew/operator/settings.php b/src/mibew/operator/settings.php
index 900e76b9..278404ce 100644
--- a/src/mibew/operator/settings.php
+++ b/src/mibew/operator/settings.php
@@ -51,7 +51,7 @@ $options = array(
 );
 
 if (Settings::get('enabletracking')) {
-	$options[] = 'invitationstyle';
+	$options[] = 'invitation_style';
 	$invitationstylelist = InvitationStyle::availableStyles();
 }
 
@@ -83,9 +83,9 @@ if (isset($_POST['email']) && isset($_POST['title']) && isset($_POST['logo'])) {
 	}
 
 	if (Settings::get('enabletracking')) {
-		$params['invitationstyle'] = verifyparam("invitationstyle", "/^\w+$/", $params['invitationstyle']);
-		if (!in_array($params['invitationstyle'], $invitationstylelist)) {
-			$params['invitationstyle'] = $invitationstylelist[0];
+		$params['invitation_style'] = verifyparam("invitation_style", "/^\w+$/", $params['invitation_style']);
+		if (!in_array($params['invitation_style'], $invitationstylelist)) {
+			$params['invitation_style'] = $invitationstylelist[0];
 		}
 	}
 
@@ -135,7 +135,7 @@ $page['formcronkey'] = $params['cron_key'];
 $page['cron_path'] = cron_get_uri($params['cron_key']);
 
 if (Settings::get('enabletracking')) {
-	$page['forminvitationstyle'] = $params['invitationstyle'];
+	$page['forminvitationstyle'] = $params['invitation_style'];
 	$page['availableInvitationStyles'] = $invitationstylelist;
 }
 
diff --git a/src/mibew/styles/pages/default/views/settings.php b/src/mibew/styles/pages/default/views/settings.php
index ef486039..5875822a 100644
--- a/src/mibew/styles/pages/default/views/settings.php
+++ b/src/mibew/styles/pages/default/views/settings.php
@@ -141,11 +141,11 @@ require_once(dirname(__FILE__).'/inc_errors.php');
 		</div>
 <?php if ($page['enabletracking']) { ?>
 		<div class="field">
-			<label for="invitationstyle" class="flabel"><?php echo getlocal('settings.invitationstyle') ?></label>
+			<label for="invitation_style" class="flabel"><?php echo getlocal('settings.invitationstyle') ?></label>
 			<div class="fvalue">
-				<select id="invitationstyle" name="invitationstyle" ><?php foreach($page['availableInvitationStyles'] as $k) { echo "<option value=\"".$k."\"".($k == form_value("invitationstyle") ? " selected=\"selected\"" : "").">".$k."</option>"; } ?></select>
+				<select id="invitation_style" name="invitation_style" ><?php foreach($page['availableInvitationStyles'] as $k) { echo "<option value=\"".$k."\"".($k == form_value("invitationstyle") ? " selected=\"selected\"" : "").">".$k."</option>"; } ?></select>
 			</div>
-			<label for="invitationstyle" class="fdescr"> &mdash; <?php echo getlocal('settings.invitationstyle.description') ?></label>
+			<label for="invitation_style" class="fdescr"> &mdash; <?php echo getlocal('settings.invitationstyle.description') ?></label>
 			<br clear="all"/>
 		</div>
 <?php } ?>