diff --git a/build/gen_stub.php b/build/gen_stub.php
index 19e79c79420..9fc26052c86 100755
--- a/build/gen_stub.php
+++ b/build/gen_stub.php
@@ -4555,15 +4555,15 @@ function replaceClassSynopses(string $targetDirectory, array $classMap, iterable
                 continue;
             }
 
-            $firstChild = $classSynopsis->firstElementChild;
-            if ($firstChild === null) {
+            $child = $classSynopsis->firstElementChild;
+            if ($child === null) {
                 continue;
             }
-            $firstChild = $firstChild->firstElementChild;
-            if ($firstChild === null) {
+            $child = $child->lastElementChild;
+            if ($child === null) {
                 continue;
             }
-            $className = $firstChild->textContent;
+            $className = $child->textContent;
             if (!isset($classMap[$className])) {
                 continue;
             }