diff --git a/lib/SimpleSAML/Logger/FileLoggingHandler.php b/lib/SimpleSAML/Logger/FileLoggingHandler.php
index c636c7d9479a24474f84f3689d7c48f3879c9061..ec06001f32844188d321faf2d0e556d8258910ef 100644
--- a/lib/SimpleSAML/Logger/FileLoggingHandler.php
+++ b/lib/SimpleSAML/Logger/FileLoggingHandler.php
@@ -28,7 +28,7 @@ class FileLoggingHandler implements LoggingHandlerInterface
      *
      * @var array<int, string>
      */
-    private static $levelNames = [
+    private static array $levelNames = [
         Logger::EMERG   => 'EMERGENCY',
         Logger::ALERT   => 'ALERT',
         Logger::CRIT    => 'CRITICAL',