diff --git a/dictionaries/PropertyMap.php b/dictionaries/PropertyMap.php
index d8396702429..3dd2f9f605b 100644
--- a/dictionaries/PropertyMap.php
+++ b/dictionaries/PropertyMap.php
@@ -113,7 +113,7 @@
         'formatOutput' => 'bool',
         'implementation' => 'DOMImplementation',
         'lastElementChild' => 'DOMElement|null',
-        'preserveWhitespace' => 'bool',
+        'preserveWhiteSpace' => 'bool',
         'recover' => 'bool',
         'resolveExternals' => 'bool',
         'standalone' => 'bool',