diff --git a/src/Standards/PSR12/Sniffs/Files/FileHeaderSniff.php b/src/Standards/PSR12/Sniffs/Files/FileHeaderSniff.php
index 8a8255cf47..c3d0d0cadc 100644
--- a/src/Standards/PSR12/Sniffs/Files/FileHeaderSniff.php
+++ b/src/Standards/PSR12/Sniffs/Files/FileHeaderSniff.php
@@ -188,6 +188,7 @@ public function getHeaderLines(File $phpcsFile, $stackPtr)
 
                 if (isset($commentOpeners[$tokens[$docToken]['code']]) === false
                     && isset(Tokens::$methodPrefixes[$tokens[$docToken]['code']]) === false
+                    && $tokens[$docToken]['code'] !== T_READONLY
                 ) {
                     // Check for an @var annotation.
                     $annotation = false;
diff --git a/src/Standards/PSR12/Tests/Files/FileHeaderUnitTest.18.inc b/src/Standards/PSR12/Tests/Files/FileHeaderUnitTest.18.inc
new file mode 100644
index 0000000000..be7c11ac91
--- /dev/null
+++ b/src/Standards/PSR12/Tests/Files/FileHeaderUnitTest.18.inc
@@ -0,0 +1,16 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Test;
+
+/**
+ * Sniff should recognize the PHP 8.2 `readonly` keyword as an OO prefix. 
+ */
+readonly class Example
+{
+    public function test() : void
+    {
+        echo '123';
+    }
+}