diff --git a/build/gen_stub.php b/build/gen_stub.php
index 153e3a681c0..f49958243cf 100755
--- a/build/gen_stub.php
+++ b/build/gen_stub.php
@@ -357,11 +357,6 @@ class SimpleType {
         return new SimpleType("object", true);
     }
 
-    public static function void(): SimpleType
-    {
-        return new SimpleType("void", true);
-    }
-
     protected function __construct(string $name, bool $isBuiltin) {
         $this->name = $name;
         $this->isBuiltin = $isBuiltin;