diff --git a/dlls/mshtml/htmldoc.c b/dlls/mshtml/htmldoc.c
index eee35297d8b..a41b4654e60 100644
--- a/dlls/mshtml/htmldoc.c
+++ b/dlls/mshtml/htmldoc.c
@@ -1722,7 +1722,7 @@ static BOOL htmldoc_qi(HTMLDocument *This, REFIID riid, void **ppv)
         *ppv = &This->IHTMLDocument3_iface;
     }else if(IsEqualGUID(&IID_IHTMLDocument4, riid)) {
         TRACE("(%p)->(IID_IHTMLDocument4, %p)\n", This, ppv);
-        *ppv = HTMLDOC4(This);
+        *ppv = &This->IHTMLDocument4_iface;
     }else if(IsEqualGUID(&IID_IHTMLDocument5, riid)) {
         TRACE("(%p)->(IID_IHTMLDocument5, %p)\n", This, ppv);
         *ppv = HTMLDOC5(This);
diff --git a/dlls/mshtml/htmldoc3.c b/dlls/mshtml/htmldoc3.c
index ee863e0d726..2ba480a8601 100644
--- a/dlls/mshtml/htmldoc3.c
+++ b/dlls/mshtml/htmldoc3.c
@@ -636,37 +636,40 @@ static const IHTMLDocument3Vtbl HTMLDocument3Vtbl = {
     HTMLDocument3_getElementsByTagName
 };
 
-#define HTMLDOC4_THIS(iface) DEFINE_THIS(HTMLDocument, HTMLDocument4, iface)
+static inline HTMLDocument *impl_from_IHTMLDocument4(IHTMLDocument4 *iface)
+{
+    return CONTAINING_RECORD(iface, HTMLDocument, IHTMLDocument4_iface);
+}
 
 static HRESULT WINAPI HTMLDocument4_QueryInterface(IHTMLDocument4 *iface,
                                                    REFIID riid, void **ppv)
 {
-    HTMLDocument *This = HTMLDOC4_THIS(iface);
+    HTMLDocument *This = impl_from_IHTMLDocument4(iface);
     return htmldoc_query_interface(This, riid, ppv);
 }
 
 static ULONG WINAPI HTMLDocument4_AddRef(IHTMLDocument4 *iface)
 {
-    HTMLDocument *This = HTMLDOC4_THIS(iface);
+    HTMLDocument *This = impl_from_IHTMLDocument4(iface);
     return htmldoc_addref(This);
 }
 
 static ULONG WINAPI HTMLDocument4_Release(IHTMLDocument4 *iface)
 {
-    HTMLDocument *This = HTMLDOC4_THIS(iface);
+    HTMLDocument *This = impl_from_IHTMLDocument4(iface);
     return htmldoc_release(This);
 }
 
 static HRESULT WINAPI HTMLDocument4_GetTypeInfoCount(IHTMLDocument4 *iface, UINT *pctinfo)
 {
-    HTMLDocument *This = HTMLDOC4_THIS(iface);
+    HTMLDocument *This = impl_from_IHTMLDocument4(iface);
     return IDispatchEx_GetTypeInfoCount(DISPATCHEX(This), pctinfo);
 }
 
 static HRESULT WINAPI HTMLDocument4_GetTypeInfo(IHTMLDocument4 *iface, UINT iTInfo,
                                                 LCID lcid, ITypeInfo **ppTInfo)
 {
-    HTMLDocument *This = HTMLDOC4_THIS(iface);
+    HTMLDocument *This = impl_from_IHTMLDocument4(iface);
     return IDispatchEx_GetTypeInfo(DISPATCHEX(This), iTInfo, lcid, ppTInfo);
 }
 
@@ -674,7 +677,7 @@ static HRESULT WINAPI HTMLDocument4_GetIDsOfNames(IHTMLDocument4 *iface, REFIID
                                                 LPOLESTR *rgszNames, UINT cNames,
                                                 LCID lcid, DISPID *rgDispId)
 {
-    HTMLDocument *This = HTMLDOC4_THIS(iface);
+    HTMLDocument *This = impl_from_IHTMLDocument4(iface);
     return IDispatchEx_GetIDsOfNames(DISPATCHEX(This), riid, rgszNames, cNames, lcid, rgDispId);
 }
 
@@ -682,14 +685,14 @@ static HRESULT WINAPI HTMLDocument4_Invoke(IHTMLDocument4 *iface, DISPID dispIdM
                             REFIID riid, LCID lcid, WORD wFlags, DISPPARAMS *pDispParams,
                             VARIANT *pVarResult, EXCEPINFO *pExcepInfo, UINT *puArgErr)
 {
-    HTMLDocument *This = HTMLDOC4_THIS(iface);
+    HTMLDocument *This = impl_from_IHTMLDocument4(iface);
     return IDispatchEx_Invoke(DISPATCHEX(This), dispIdMember, riid, lcid, wFlags, pDispParams,
             pVarResult, pExcepInfo, puArgErr);
 }
 
 static HRESULT WINAPI HTMLDocument4_focus(IHTMLDocument4 *iface)
 {
-    HTMLDocument *This = HTMLDOC4_THIS(iface);
+    HTMLDocument *This = impl_from_IHTMLDocument4(iface);
     nsIDOMNSHTMLElement *nselem;
     nsIDOMHTMLElement *nsbody;
     nsresult nsres;
@@ -721,28 +724,28 @@ static HRESULT WINAPI HTMLDocument4_focus(IHTMLDocument4 *iface)
 
 static HRESULT WINAPI HTMLDocument4_hasFocus(IHTMLDocument4 *iface, VARIANT_BOOL *pfFocus)
 {
-    HTMLDocument *This = HTMLDOC4_THIS(iface);
+    HTMLDocument *This = impl_from_IHTMLDocument4(iface);
     FIXME("(%p)->(%p)\n", This, pfFocus);
     return E_NOTIMPL;
 }
 
 static HRESULT WINAPI HTMLDocument4_put_onselectionchange(IHTMLDocument4 *iface, VARIANT v)
 {
-    HTMLDocument *This = HTMLDOC4_THIS(iface);
+    HTMLDocument *This = impl_from_IHTMLDocument4(iface);
     FIXME("(%p)->(v)\n", This);
     return E_NOTIMPL;
 }
 
 static HRESULT WINAPI HTMLDocument4_get_onselectionchange(IHTMLDocument4 *iface, VARIANT *p)
 {
-    HTMLDocument *This = HTMLDOC4_THIS(iface);
+    HTMLDocument *This = impl_from_IHTMLDocument4(iface);
     FIXME("(%p)->(%p)\n", This, p);
     return E_NOTIMPL;
 }
 
 static HRESULT WINAPI HTMLDocument4_get_namespace(IHTMLDocument4 *iface, IDispatch **p)
 {
-    HTMLDocument *This = HTMLDOC4_THIS(iface);
+    HTMLDocument *This = impl_from_IHTMLDocument4(iface);
     FIXME("(%p)->(%p)\n", This, p);
     return E_NOTIMPL;
 }
@@ -750,21 +753,21 @@ static HRESULT WINAPI HTMLDocument4_get_namespace(IHTMLDocument4 *iface, IDispat
 static HRESULT WINAPI HTMLDocument4_createDocumentFromUrl(IHTMLDocument4 *iface, BSTR bstrUrl,
         BSTR bstrOptions, IHTMLDocument2 **newDoc)
 {
-    HTMLDocument *This = HTMLDOC4_THIS(iface);
+    HTMLDocument *This = impl_from_IHTMLDocument4(iface);
     FIXME("(%p)->(%s %s %p)\n", This, debugstr_w(bstrUrl), debugstr_w(bstrOptions), newDoc);
     return E_NOTIMPL;
 }
 
 static HRESULT WINAPI HTMLDocument4_put_media(IHTMLDocument4 *iface, BSTR v)
 {
-    HTMLDocument *This = HTMLDOC4_THIS(iface);
+    HTMLDocument *This = impl_from_IHTMLDocument4(iface);
     FIXME("(%p)->(%s)\n", This, debugstr_w(v));
     return E_NOTIMPL;
 }
 
 static HRESULT WINAPI HTMLDocument4_get_media(IHTMLDocument4 *iface, BSTR *p)
 {
-    HTMLDocument *This = HTMLDOC4_THIS(iface);
+    HTMLDocument *This = impl_from_IHTMLDocument4(iface);
     FIXME("(%p)->(%p)\n", This, p);
     return E_NOTIMPL;
 }
@@ -772,7 +775,7 @@ static HRESULT WINAPI HTMLDocument4_get_media(IHTMLDocument4 *iface, BSTR *p)
 static HRESULT WINAPI HTMLDocument4_createEventObject(IHTMLDocument4 *iface,
         VARIANT *pvarEventObject, IHTMLEventObj **ppEventObj)
 {
-    HTMLDocument *This = HTMLDOC4_THIS(iface);
+    HTMLDocument *This = impl_from_IHTMLDocument4(iface);
     FIXME("(%p)->(%p %p)\n", This, pvarEventObject, ppEventObj);
     return E_NOTIMPL;
 }
@@ -780,7 +783,7 @@ static HRESULT WINAPI HTMLDocument4_createEventObject(IHTMLDocument4 *iface,
 static HRESULT WINAPI HTMLDocument4_fireEvent(IHTMLDocument4 *iface, BSTR bstrEventName,
         VARIANT *pvarEventObject, VARIANT_BOOL *pfCanceled)
 {
-    HTMLDocument *This = HTMLDOC4_THIS(iface);
+    HTMLDocument *This = impl_from_IHTMLDocument4(iface);
     FIXME("(%p)->(%s %p %p)\n", This, debugstr_w(bstrEventName), pvarEventObject, pfCanceled);
     return E_NOTIMPL;
 }
@@ -788,34 +791,32 @@ static HRESULT WINAPI HTMLDocument4_fireEvent(IHTMLDocument4 *iface, BSTR bstrEv
 static HRESULT WINAPI HTMLDocument4_createRenderStyle(IHTMLDocument4 *iface, BSTR v,
         IHTMLRenderStyle **ppIHTMLRenderStyle)
 {
-    HTMLDocument *This = HTMLDOC4_THIS(iface);
+    HTMLDocument *This = impl_from_IHTMLDocument4(iface);
     FIXME("(%p)->(%s %p)\n", This, debugstr_w(v), ppIHTMLRenderStyle);
     return E_NOTIMPL;
 }
 
 static HRESULT WINAPI HTMLDocument4_put_oncontrolselect(IHTMLDocument4 *iface, VARIANT v)
 {
-    HTMLDocument *This = HTMLDOC4_THIS(iface);
+    HTMLDocument *This = impl_from_IHTMLDocument4(iface);
     FIXME("(%p)->(v)\n", This);
     return E_NOTIMPL;
 }
 
 static HRESULT WINAPI HTMLDocument4_get_oncontrolselect(IHTMLDocument4 *iface, VARIANT *p)
 {
-    HTMLDocument *This = HTMLDOC4_THIS(iface);
+    HTMLDocument *This = impl_from_IHTMLDocument4(iface);
     FIXME("(%p)->(%p)\n", This, p);
     return E_NOTIMPL;
 }
 
 static HRESULT WINAPI HTMLDocument4_get_URLEncoded(IHTMLDocument4 *iface, BSTR *p)
 {
-    HTMLDocument *This = HTMLDOC4_THIS(iface);
+    HTMLDocument *This = impl_from_IHTMLDocument4(iface);
     FIXME("(%p)->(%p)\n", This, p);
     return E_NOTIMPL;
 }
 
-#undef HTMLDOC4_THIS
-
 static const IHTMLDocument4Vtbl HTMLDocument4Vtbl = {
     HTMLDocument4_QueryInterface,
     HTMLDocument4_AddRef,
@@ -843,5 +844,5 @@ static const IHTMLDocument4Vtbl HTMLDocument4Vtbl = {
 void HTMLDocument_HTMLDocument3_Init(HTMLDocument *This)
 {
     This->IHTMLDocument3_iface.lpVtbl = &HTMLDocument3Vtbl;
-    This->lpHTMLDocument4Vtbl = &HTMLDocument4Vtbl;
+    This->IHTMLDocument4_iface.lpVtbl = &HTMLDocument4Vtbl;
 }
diff --git a/dlls/mshtml/mshtml_private.h b/dlls/mshtml/mshtml_private.h
index 74a2d8f9216..5cf5f552b3d 100644
--- a/dlls/mshtml/mshtml_private.h
+++ b/dlls/mshtml/mshtml_private.h
@@ -344,7 +344,7 @@ struct ConnectionPoint {
 struct HTMLDocument {
     IHTMLDocument2              IHTMLDocument2_iface;
     IHTMLDocument3              IHTMLDocument3_iface;
-    const IHTMLDocument4Vtbl              *lpHTMLDocument4Vtbl;
+    IHTMLDocument4              IHTMLDocument4_iface;
     const IHTMLDocument5Vtbl              *lpHTMLDocument5Vtbl;
     const IHTMLDocument6Vtbl              *lpHTMLDocument6Vtbl;
     const IPersistMonikerVtbl             *lpPersistMonikerVtbl;
@@ -626,7 +626,6 @@ struct HTMLDocumentNode {
 #define HTMLWINDOW3(x)   ((IHTMLWindow3*)                 &(x)->lpHTMLWindow3Vtbl)
 #define HTMLWINDOW4(x)   ((IHTMLWindow4*)                 &(x)->lpHTMLWindow4Vtbl)
 
-#define HTMLDOC4(x)      ((IHTMLDocument4*)               &(x)->lpHTMLDocument4Vtbl)
 #define HTMLDOC5(x)      ((IHTMLDocument5*)               &(x)->lpHTMLDocument5Vtbl)
 #define HTMLDOC6(x)      ((IHTMLDocument6*)               &(x)->lpHTMLDocument6Vtbl)
 #define PERSIST(x)       ((IPersist*)                     &(x)->lpPersistFileVtbl)