diff --git a/Sources/ErrorHandler.php b/Sources/ErrorHandler.php
index 4633b2cf86..f0b7d33942 100644
--- a/Sources/ErrorHandler.php
+++ b/Sources/ErrorHandler.php
@@ -336,7 +336,7 @@ public static function fatalLang(string $error, string|bool $log = 'general', ar
 		}
 
 		// Send a custom header if we have a custom message.
-		if (isset($_REQUEST['js']) || isset($_REQUEST['xml']) || isset($_RQEUEST['ajax'])) {
+		if (isset($_REQUEST['js']) || isset($_REQUEST['xml']) || isset($_REQUEST['ajax'])) {
 			header('X-SMF-errormsg: ' . $error_message);
 		}