diff --git a/src/Psalm/Config.php b/src/Psalm/Config.php
index 8677dad5fac..3256462902a 100644
--- a/src/Psalm/Config.php
+++ b/src/Psalm/Config.php
@@ -811,7 +811,7 @@ private static function processConfigDeprecations(
                 self::CONFIG_NAMESPACE,
                 $deprecated_element
             );
-            if ($deprecated_elements_xml->count()) {
+            if ($deprecated_elements_xml->length) {
                 $deprecated_element_xml = $deprecated_elements_xml->item(0);
                 assert($deprecated_element_xml !== null);
                 $line = $deprecated_element_xml->getLineNo();