diff --git a/src/Php/CompilerBase.php b/src/Php/CompilerBase.php
index db71194b..d966edf5 100644
--- a/src/Php/CompilerBase.php
+++ b/src/Php/CompilerBase.php
@@ -1004,6 +1004,9 @@ class CompilerBase extends \PhpAot\Core\Translator
                 if ($param->type instanceof NullableType) {
                     $type = $param->type->type;
                     $nullable = true;
+                } elseif ($param->type instanceof UnionType) {
+                    $type = 'mixed';
+                    $nullable = false;
                 } else {
                     $type = $param->type === null ? '' : $param->type;
                     $nullable = false;
diff --git a/tests/aot/prop-004.phpt b/tests/aot/prop-004.phpt
new file mode 100644
index 00000000..68e03a0f
--- /dev/null
+++ b/tests/aot/prop-004.phpt
@@ -0,0 +1,18 @@
+--TEST--
+Property with nullable type
+--FILE--
+<?php
+class Foo
+{
+    public function __construct(public string|Stringable $value)
+    {
+    }
+}
+
+function main() {
+    $foo = new Foo('Continue');
+    var_dump($foo->value);
+}
+?>
+--EXPECT--
+string(8) "Continue"
\ No newline at end of file