diff --git a/config.xsd b/config.xsd
index e2301ea7890..2d295436a2e 100644
--- a/config.xsd
+++ b/config.xsd
@@ -128,6 +128,7 @@
         <xs:attribute name="limitMethodComplexity" type="xs:boolean" default="false" />
         <xs:attribute name="disableSuppressAll" type="xs:boolean" default="false" />
         <xs:attribute name="triggerErrorExits" type="TriggerErrorExitsType" default="default" />
+        <xs:attribute name="threads" type="xs:integer" />
     </xs:complexType>
 
     <xs:complexType name="ProjectFilesType">
diff --git a/src/Psalm/Config.php b/src/Psalm/Config.php
index 2ca59125dc3..33035789e97 100644
--- a/src/Psalm/Config.php
+++ b/src/Psalm/Config.php
@@ -1252,8 +1252,8 @@ private static function fromXmlAndPaths(
             }
         }
 
-        if (isset($config_xml->threads)) {
-            $config->threads = (int)$config_xml->threads;
+        if (isset($config_xml['threads'])) {
+            $config->threads = (int)$config_xml['threads'];
         }
 
         return $config;