diff --git a/dictionaries/CallMap.php b/dictionaries/CallMap.php
index 71095ee5b78..c54df91f60c 100644
--- a/dictionaries/CallMap.php
+++ b/dictionaries/CallMap.php
@@ -2078,8 +2078,8 @@
 'DOMAttr::isId' => ['bool'],
 'DOMAttr::isSameNode' => ['bool', 'node'=>'DOMNode'],
 'DOMAttr::isSupported' => ['bool', 'feature'=>'string', 'version'=>'string'],
-'DOMAttr::lookupNamespaceUri' => ['string', 'prefix'=>'string'],
-'DOMAttr::lookupPrefix' => ['string', 'namespaceuri'=>'string'],
+'DOMAttr::lookupNamespaceUri' => ['string|null', 'prefix'=>'string|null'],
+'DOMAttr::lookupPrefix' => ['string|null', 'namespaceuri'=>'string'],
 'DOMAttr::normalize' => ['void'],
 'DOMAttr::removeChild' => ['DOMNode', 'oldnode'=>'DOMNode'],
 'DOMAttr::replaceChild' => ['DOMNode', 'newnode'=>'DOMNode', 'oldnode'=>'DOMNode'],
@@ -2183,8 +2183,8 @@
 'DOMNode::isDefaultNamespace' => ['bool', 'namespaceuri'=>'string'],
 'DOMNode::isSameNode' => ['bool', 'node'=>'DOMNode'],
 'DOMNode::isSupported' => ['bool', 'feature'=>'string', 'version'=>'string'],
-'DOMNode::lookupNamespaceURI' => ['string', 'prefix'=>'string'],
-'DOMNode::lookupPrefix' => ['string', 'namespaceuri'=>'string'],
+'DOMNode::lookupNamespaceURI' => ['string|null', 'prefix'=>'string|null'],
+'DOMNode::lookupPrefix' => ['string|null', 'namespaceuri'=>'string'],
 'DOMNode::normalize' => ['void'],
 'DOMNode::removeChild' => ['DOMNode', 'oldnode'=>'DOMNode'],
 'DOMNode::replaceChild' => ['DOMNode|false', 'newnode'=>'DOMNode', 'oldnode'=>'DOMNode'],
diff --git a/dictionaries/CallMap_historical.php b/dictionaries/CallMap_historical.php
index aa88e0ba221..5cb9eb09eed 100644
--- a/dictionaries/CallMap_historical.php
+++ b/dictionaries/CallMap_historical.php
@@ -911,8 +911,8 @@
     'DOMAttr::isId' => ['bool'],
     'DOMAttr::isSameNode' => ['bool', 'node'=>'DOMNode'],
     'DOMAttr::isSupported' => ['bool', 'feature'=>'string', 'version'=>'string'],
-    'DOMAttr::lookupNamespaceUri' => ['string', 'prefix'=>'string'],
-    'DOMAttr::lookupPrefix' => ['string', 'namespaceuri'=>'string'],
+    'DOMAttr::lookupNamespaceUri' => ['string|null', 'prefix'=>'string|null'],
+    'DOMAttr::lookupPrefix' => ['string|null', 'namespaceuri'=>'string'],
     'DOMAttr::normalize' => ['void'],
     'DOMAttr::removeChild' => ['DOMNode', 'oldnode'=>'DOMNode'],
     'DOMAttr::replaceChild' => ['DOMNode', 'newnode'=>'DOMNode', 'oldnode'=>'DOMNode'],
@@ -1004,8 +1004,8 @@
     'DOMNode::isDefaultNamespace' => ['bool', 'namespaceuri'=>'string'],
     'DOMNode::isSameNode' => ['bool', 'node'=>'DOMNode'],
     'DOMNode::isSupported' => ['bool', 'feature'=>'string', 'version'=>'string'],
-    'DOMNode::lookupNamespaceURI' => ['string', 'prefix'=>'string'],
-    'DOMNode::lookupPrefix' => ['string', 'namespaceuri'=>'string'],
+    'DOMNode::lookupNamespaceURI' => ['string|null', 'prefix'=>'string|null'],
+    'DOMNode::lookupPrefix' => ['string|null', 'namespaceuri'=>'string'],
     'DOMNode::normalize' => ['void'],
     'DOMNode::removeChild' => ['DOMNode', 'oldnode'=>'DOMNode'],
     'DOMNode::replaceChild' => ['DOMNode|false', 'newnode'=>'DOMNode', 'oldnode'=>'DOMNode'],