diff --git a/vm/src/vm.rs b/vm/src/vm.rs
index 42a66dab4..19ad8b48f 100644
--- a/vm/src/vm.rs
+++ b/vm/src/vm.rs
@@ -209,6 +209,12 @@ impl VirtualMachine {
         vm
     }
 
+    /// `update_sysmodule` should be called when the `vm.stdlib_inits` are changed,
+    /// and then the `builtin_module_names` of `sys` module will be updated.
+    pub fn update_sysmodule(&self) {
+        sysmodule::make_module(self, self.sys_module.clone(), self.builtins.clone());
+    }
+
     pub fn run_code_obj(&self, code: PyCodeRef, scope: Scope) -> PyResult {
         let frame = Frame::new(code, scope).into_ref(self);
         self.run_frame_full(frame)
diff --git a/wasm/lib/src/vm_class.rs b/wasm/lib/src/vm_class.rs
index d3e060059..a1d95d4cb 100644
--- a/wasm/lib/src/vm_class.rs
+++ b/wasm/lib/src/vm_class.rs
@@ -44,6 +44,9 @@ impl StoredVirtualMachine {
             setup_browser_module(&vm);
         }
 
+        // sys module needs to be updated because js_module and browser_module is setted
+        vm.update_sysmodule();
+
         import::init_importlib(&vm, false).unwrap();
 
         StoredVirtualMachine {