diff --git a/dlls/jscript/dispex.c b/dlls/jscript/dispex.c
index 1dd18fcc2ee..4e40cdf1bea 100644
--- a/dlls/jscript/dispex.c
+++ b/dlls/jscript/dispex.c
@@ -2388,7 +2388,19 @@ static void WINAPI WineJSDispatch_Free(IWineJSDispatch *iface)
 {
    jsdisp_t *This = impl_from_IWineJSDispatch(iface);
    jsdisp_free(This);
- }
+}
+
+static HRESULT WINAPI WineJSDispatch_GetPropertyFlags(IWineJSDispatch *iface, DISPID id, UINT32 *ret)
+{
+    jsdisp_t *This = impl_from_IWineJSDispatch(iface);
+    dispex_prop_t *prop = get_prop(This, id);
+
+    if(!prop || prop->type == PROP_DELETED || prop->type == PROP_PROTREF)
+        return DISP_E_MEMBERNOTFOUND;
+
+    *ret = prop->flags & PROPF_PUBLIC_MASK;
+    return S_OK;
+}
 
 static HRESULT WINAPI WineJSDispatch_GetScriptGlobal(IWineJSDispatch *iface, IWineJSDispatchHost **ret)
 {
@@ -2422,6 +2434,7 @@ static IWineJSDispatchVtbl DispatchExVtbl = {
     DispatchEx_GetNextDispID,
     DispatchEx_GetNameSpaceParent,
     WineJSDispatch_Free,
+    WineJSDispatch_GetPropertyFlags,
     WineJSDispatch_GetScriptGlobal,
 };
 
diff --git a/dlls/jscript/jsdisp.idl b/dlls/jscript/jsdisp.idl
index 051f819e817..5f1384bce78 100644
--- a/dlls/jscript/jsdisp.idl
+++ b/dlls/jscript/jsdisp.idl
@@ -51,6 +51,7 @@ interface IWineJSDispatchHost;
 interface IWineJSDispatch : IDispatchEx
 {
     void Free();
+    HRESULT GetPropertyFlags(DISPID id, UINT32 *ret);
     HRESULT GetScriptGlobal(IWineJSDispatchHost **ret);
 }
 
diff --git a/dlls/mshtml/htmlscript.h b/dlls/mshtml/htmlscript.h
index 30b46677395..c1b1aa2c4bc 100644
--- a/dlls/mshtml/htmlscript.h
+++ b/dlls/mshtml/htmlscript.h
@@ -50,5 +50,6 @@ void update_browser_script_mode(GeckoBrowser*,IUri*);
 BOOL find_global_prop(HTMLInnerWindow*,const WCHAR*,DWORD,ScriptHost**,DISPID*);
 HRESULT global_prop_still_exists(HTMLInnerWindow*,global_prop_t*);
 IDispatch *get_script_disp(ScriptHost*);
+IWineJSDispatch *get_script_jsdisp(ScriptHost*);
 IActiveScriptSite *get_first_script_site(HTMLInnerWindow*);
 void initialize_script_global(HTMLInnerWindow*);
diff --git a/dlls/mshtml/htmlwindow.c b/dlls/mshtml/htmlwindow.c
index b6f66627dd9..3624c128cca 100644
--- a/dlls/mshtml/htmlwindow.c
+++ b/dlls/mshtml/htmlwindow.c
@@ -4029,7 +4029,9 @@ static HRESULT HTMLWindow_next_dispid(DispatchEx *dispex, DISPID id, DISPID *pid
 HRESULT HTMLWindow_get_prop_desc(DispatchEx *dispex, DISPID id, struct property_info *desc)
 {
     HTMLInnerWindow *This = impl_from_DispatchEx(dispex);
+    IWineJSDispatch *jsdisp;
     global_prop_t *prop;
+    HRESULT hres = S_OK;
 
     if(id - MSHTML_DISPID_CUSTOM_MIN >= This->global_prop_cnt)
         return DISP_E_MEMBERNOTFOUND;
@@ -4038,10 +4040,22 @@ HRESULT HTMLWindow_get_prop_desc(DispatchEx *dispex, DISPID id, struct property_
     desc->name = prop->name;
     desc->id = id;
     desc->flags = PROPF_WRITABLE | PROPF_CONFIGURABLE;
-    if(prop->type == GLOBAL_DISPEXVAR)
-        desc->flags |= PROPF_ENUMERABLE;
     desc->iid = 0;
-    return S_OK;
+
+    switch(prop->type) {
+    case GLOBAL_SCRIPTVAR: {
+        if((jsdisp = get_script_jsdisp(prop->script_host)))
+            hres = IWineJSDispatch_GetPropertyFlags(jsdisp, prop->id, &desc->flags);
+        break;
+    }
+    case GLOBAL_DISPEXVAR:
+        desc->flags |= PROPF_ENUMERABLE;
+        break;
+    default:
+        break;
+    }
+
+    return hres;
 }
 
 static HTMLInnerWindow *HTMLWindow_get_script_global(DispatchEx *dispex)
diff --git a/dlls/mshtml/script.c b/dlls/mshtml/script.c
index 73bb8e1d5c6..3ad1da8cf3c 100644
--- a/dlls/mshtml/script.c
+++ b/dlls/mshtml/script.c
@@ -85,7 +85,7 @@ struct ScriptHost {
     SCRIPTSTATE script_state;
 
     HTMLInnerWindow *window;
-    IDispatchEx *script_dispex;
+    IWineJSDispatch *script_jsdisp;
 
     GUID guid;
     struct list entry;
@@ -264,7 +264,7 @@ static BOOL init_script_engine(ScriptHost *script_host, IActiveScript *script)
             if(FAILED(hres))
                 WARN("GetScriptDispatch failed: %08lx\n", hres);
             else {
-                IDispatch_QueryInterface(script_disp, &IID_IDispatchEx, (void**)&script_host->script_dispex);
+                IDispatch_QueryInterface(script_disp, &IID_IWineJSDispatch, (void**)&script_host->script_jsdisp);
                 IDispatch_Release(script_disp);
             }
         }
@@ -301,8 +301,8 @@ static void release_script_engine(ScriptHost *This)
         unlink_ref(&This->parse);
     }
 
-    if(This->script_dispex)
-        IDispatchEx_Release(This->script_dispex);
+    if(This->script_jsdisp)
+        IWineJSDispatch_Release(This->script_jsdisp);
     IActiveScript_Release(This->script);
     This->script = NULL;
     This->script_state = SCRIPTSTATE_UNINITIALIZED;
@@ -1588,6 +1588,11 @@ IDispatch *get_script_disp(ScriptHost *script_host)
     return disp;
 }
 
+IWineJSDispatch *get_script_jsdisp(ScriptHost *script_host)
+{
+    return script_host->script_jsdisp;
+}
+
 IActiveScriptSite *get_first_script_site(HTMLInnerWindow *window)
 {
     if(list_empty(&window->script_hosts)) {
@@ -1850,9 +1855,9 @@ HRESULT global_prop_still_exists(HTMLInnerWindow *window, global_prop_t *prop)
 
         if(!prop->script_host->script)
             return E_UNEXPECTED;
-        if(!prop->script_host->script_dispex)
+        if(!prop->script_host->script_jsdisp)
             return S_OK;
-        return IDispatchEx_GetMemberProperties(prop->script_host->script_dispex, prop->id, 0, &properties);
+        return IWineJSDispatch_GetMemberProperties(prop->script_host->script_jsdisp, prop->id, 0, &properties);
     }
     case GLOBAL_ELEMENTVAR: {
         IHTMLElement *elem;
diff --git a/dlls/mshtml/tests/es5.js b/dlls/mshtml/tests/es5.js
index 9d6a4eb8418..0033a06fa3c 100644
--- a/dlls/mshtml/tests/es5.js
+++ b/dlls/mshtml/tests/es5.js
@@ -2251,10 +2251,8 @@ sync_test("globals override", function() {
     for(i = 0; i < builtins.length; i++) {
         desc = Object.getOwnPropertyDescriptor(window, builtins[i]);
         ok(desc !== undefined, "getOwnPropertyDescriptor('" + builtins[i] + "' returned undefined");
-        todo_wine.
         ok(desc.configurable === false, builtins[i] + " is configurable");
         ok(desc.enumerable === false, builtins[i] + " is enumerable");
-        todo_wine.
         ok(desc.writable === false, builtins[i] + " is writable");
     }
 });