diff --git a/lib/CurlyBraceOffsetRejector.php b/lib/CurlyBraceOffsetRejector.php
index e56b14658a8..5b8f1e77b96 100644
--- a/lib/CurlyBraceOffsetRejector.php
+++ b/lib/CurlyBraceOffsetRejector.php
@@ -149,12 +149,18 @@ private static function closingParenOpensControlBlock(array $tokens, int $closeP
             return true;
         }
 
-        // `new class(...)` anonymous class ctor args — `{` opens class body, not offset access (#6881).
+        // `new class(...)` / `new readonly class(...)` anonymous class ctor args — `{` opens class body (#6881, #17467).
         if (T_CLASS === $beforeOpen[0]) {
             $beforeClass = self::previousSignificantToken($tokens, $openParenIndex - 2);
             if (\is_array($beforeClass) && T_NEW === $beforeClass[0]) {
                 return true;
             }
+            if (\is_array($beforeClass) && \defined('T_READONLY') && T_READONLY === $beforeClass[0]) {
+                $beforeReadonly = self::previousSignificantToken($tokens, $openParenIndex - 4);
+                if (\is_array($beforeReadonly) && T_NEW === $beforeReadonly[0]) {
+                    return true;
+                }
+            }
         }
 
         if (T_STRING === $beforeOpen[0]) {
diff --git a/test/compliance/cases/language/readonly_anonymous_ctor_args.phpt b/test/compliance/cases/language/readonly_anonymous_ctor_args.phpt
new file mode 100644
index 00000000000..1e3deefc991
--- /dev/null
+++ b/test/compliance/cases/language/readonly_anonymous_ctor_args.phpt
@@ -0,0 +1,21 @@
+--TEST--
+Language: new readonly class(...) constructor args (issue #17467, Zend/zend_compile.c)
+--SKIPIF--
+<?php
+if (!class_exists('PHPCompiler\\CompilerVersion')) {
+    require __DIR__ . '/../../../../vendor/autoload.php';
+}
+if (!PHPCompiler\CompilerVersion::supportsReadonlyAnonymousClass()) {
+    die('skip new readonly class requires PHP 8.3+ forward profile');
+}
+?>
+--FILE--
+<?php
+declare(strict_types=1);
+
+$o = new readonly class(5) {
+    public function __construct(public int $x) {}
+};
+echo $o->x, "\n";
+--EXPECT--
+5
diff --git a/test/repro/maintainer_gap_readonly_anonymous_ctor_args.php b/test/repro/maintainer_gap_readonly_anonymous_ctor_args.php
new file mode 100644
index 00000000000..6860fe84198
--- /dev/null
+++ b/test/repro/maintainer_gap_readonly_anonymous_ctor_args.php
@@ -0,0 +1,9 @@
+<?php
+
+declare(strict_types=1);
+
+$o = new readonly class(5) {
+    public function __construct(public int $x) {}
+};
+
+echo $o->x, "\n";
diff --git a/test/unit/CurlyBraceOffsetRejectorTest.php b/test/unit/CurlyBraceOffsetRejectorTest.php
index 5c25d040a8d..dfd7d950b88 100644
--- a/test/unit/CurlyBraceOffsetRejectorTest.php
+++ b/test/unit/CurlyBraceOffsetRejectorTest.php
@@ -57,4 +57,10 @@ public function testAnonymousClassCtorArgsBraceIsAllowed(): void
         $code = '<?php $o = new class(1) { public function __construct(private int $x) {} };';
         self::assertSame($code, CurlyBraceOffsetRejector::reject($code, 'test.php'));
     }
+
+    public function testReadonlyAnonymousClassCtorArgsBraceIsAllowed(): void
+    {
+        $code = '<?php $o = new readonly class(5) { public function __construct(public int $x) {} };';
+        self::assertSame($code, CurlyBraceOffsetRejector::reject($code, 'test.php'));
+    }
 }