diff --git a/dictionaries/PropertyMap.php b/dictionaries/PropertyMap.php
index c5755235e91..521a1e7e34f 100644
--- a/dictionaries/PropertyMap.php
+++ b/dictionaries/PropertyMap.php
@@ -113,6 +113,7 @@
         'formatOutput' => 'bool',
         'implementation' => 'DOMImplementation',
         'lastElementChild' => 'DOMElement|null',
+        'ownerDocument' => 'null',
         'preserveWhiteSpace' => 'bool',
         'recover' => 'bool',
         'resolveExternals' => 'bool',
@@ -173,7 +174,7 @@
         'nodeName' => 'string',
         'nodeType' => 'int',
         'nodeValue' => 'string|null',
-        'ownerDocument' => 'DOMDocument|null',
+        'ownerDocument' => 'DOMDocument',
         'parentNode' => 'DOMNode|null',
         'prefix' => 'string',
         'previousSibling' => 'DOMNode|null',
diff --git a/stubs/extensions/dom.phpstub b/stubs/extensions/dom.phpstub
index 2520a479902..b240a8d143d 100644
--- a/stubs/extensions/dom.phpstub
+++ b/stubs/extensions/dom.phpstub
@@ -154,7 +154,7 @@ class DOMNode
      */
     public ?DOMNamedNodeMap $attributes;
     /** @readonly */
-    public ?DOMDocument $ownerDocument;
+    public DOMDocument $ownerDocument;
     /** @readonly */
     public ?string $namespaceURI;
     public string $prefix;
@@ -242,7 +242,7 @@ class DOMNameSpaceNode
     /** @readonly */
     public ?string $namespaceURI;
     /** @readonly */
-    public ?DOMDocument $ownerDocument;
+    public DOMDocument $ownerDocument;
     /** @readonly */
     public ?DOMNode $parentNode;
 }
@@ -281,6 +281,8 @@ class DOMDocument extends DOMNode implements DOMParentNode
     public DOMImplementation $implementation;
     /** @readonly */
     public ?DOMElement $documentElement;
+    /** @readonly */
+    public null $ownerDocument;
 
     /**
      * @deprecated
diff --git a/tests/CoreStubsTest.php b/tests/CoreStubsTest.php
index b0189897090..6b667c53f7c 100644
--- a/tests/CoreStubsTest.php
+++ b/tests/CoreStubsTest.php
@@ -424,6 +424,20 @@ function takesList(array $list): void {}
                 $globBrace = glob('abc', GLOB_BRACE);
                 PHP,
         ];
+        yield "ownerDocument's type is non-nullable DOMDocument and always null on DOMDocument itself" => [
+            'code' => '<?php
+                $a = (new DOMDocument())->ownerDocument;
+                $b = (new DOMNode())->ownerDocument;
+                $c = (new DOMElement())->ownerDocument;
+                $d = (new DOMNameSpaceNode())->ownerDocument;
+            ',
+            'assertions' => [
+                '$a===' => 'null',
+                '$b===' => 'DOMDocument',
+                '$c===' => 'DOMDocument',
+                '$d===' => 'DOMDocument',
+            ],
+        ];
     }
 
     public function providerInvalidCodeParse(): iterable
diff --git a/tests/PropertyTypeTest.php b/tests/PropertyTypeTest.php
index bf8e00f4ea5..3d066210444 100644
--- a/tests/PropertyTypeTest.php
+++ b/tests/PropertyTypeTest.php
@@ -718,7 +718,7 @@ class Foo {
                     $a = new DOMElement("foo");
                     $owner = $a->ownerDocument;',
                 'assertions' => [
-                    '$owner' => 'DOMDocument|null',
+                    '$owner' => 'DOMDocument',
                 ],
             ],
             'propertyMapHydration' => [