diff --git a/dlls/inetcomm/inetcomm_main.c b/dlls/inetcomm/inetcomm_main.c
index 4cb55226dc0..75436286631 100644
--- a/dlls/inetcomm/inetcomm_main.c
+++ b/dlls/inetcomm/inetcomm_main.c
@@ -117,13 +117,20 @@ static HRESULT WINAPI cf_CreateInstance( IClassFactory *iface, LPUNKNOWN pOuter,
 
     *ppobj = NULL;
 
+    if (pOuter && !IsEqualGUID(&IID_IUnknown, riid))
+        return CLASS_E_NOAGGREGATION;
+
     r = This->create_object( pOuter, (LPVOID*) &punk );
     if (FAILED(r))
         return r;
 
+    if (IsEqualGUID(&IID_IUnknown, riid)) {
+        *ppobj = punk;
+        return S_OK;
+    }
+
     r = IUnknown_QueryInterface( punk, riid, ppobj );
     IUnknown_Release( punk );
-
     return r;
 }
 
diff --git a/dlls/inetcomm/protocol.c b/dlls/inetcomm/protocol.c
index d560b90b092..f6600b9774b 100644
--- a/dlls/inetcomm/protocol.c
+++ b/dlls/inetcomm/protocol.c
@@ -28,31 +28,34 @@
 WINE_DEFAULT_DEBUG_CHANNEL(inetcomm);
 
 typedef struct {
+    IUnknown IUnknown_inner;
     IInternetProtocol IInternetProtocol_iface;
     IInternetProtocolInfo IInternetProtocolInfo_iface;
+
     LONG ref;
+    IUnknown *outer_unk;
 } MimeHtmlProtocol;
 
-static inline MimeHtmlProtocol *impl_from_IInternetProtocol(IInternetProtocol *iface)
+static inline MimeHtmlProtocol *impl_from_IUnknown(IUnknown *iface)
 {
-    return CONTAINING_RECORD(iface, MimeHtmlProtocol, IInternetProtocol_iface);
+    return CONTAINING_RECORD(iface, MimeHtmlProtocol, IUnknown_inner);
 }
 
-static HRESULT WINAPI MimeHtmlProtocol_QueryInterface(IInternetProtocol *iface, REFIID riid, void **ppv)
+static HRESULT WINAPI MimeHtmlProtocol_QueryInterface(IUnknown *iface, REFIID riid, void **ppv)
 {
-    MimeHtmlProtocol *This = impl_from_IInternetProtocol(iface);
+    MimeHtmlProtocol *This = impl_from_IUnknown(iface);
 
     if(IsEqualGUID(&IID_IUnknown, riid)) {
-        TRACE("(%p)->(IID_IUnknown %p)\n", iface, ppv);
+        TRACE("(%p)->(IID_IUnknown %p)\n", This, ppv);
         *ppv = &This->IInternetProtocol_iface;
     }else if(IsEqualGUID(&IID_IInternetProtocolRoot, riid)) {
-        TRACE("(%p)->(IID_IInternetProtocolRoot %p)\n", iface, ppv);
+        TRACE("(%p)->(IID_IInternetProtocolRoot %p)\n", This, ppv);
         *ppv = &This->IInternetProtocol_iface;
     }else if(IsEqualGUID(&IID_IInternetProtocol, riid)) {
-        TRACE("(%p)->(IID_IInternetProtocol %p)\n", iface, ppv);
+        TRACE("(%p)->(IID_IInternetProtocol %p)\n", This, ppv);
         *ppv = &This->IInternetProtocol_iface;
     }else if(IsEqualGUID(&IID_IInternetProtocolInfo, riid)) {
-        TRACE("(%p)->(IID_IInternetProtocolInfo %p)\n", iface, ppv);
+        TRACE("(%p)->(IID_IInternetProtocolInfo %p)\n", This, ppv);
         *ppv = &This->IInternetProtocolInfo_iface;
     }else {
         FIXME("unknown interface %s\n", debugstr_guid(riid));
@@ -64,9 +67,9 @@ static HRESULT WINAPI MimeHtmlProtocol_QueryInterface(IInternetProtocol *iface,
     return S_OK;
 }
 
-static ULONG WINAPI MimeHtmlProtocol_AddRef(IInternetProtocol *iface)
+static ULONG WINAPI MimeHtmlProtocol_AddRef(IUnknown *iface)
 {
-    MimeHtmlProtocol *This = impl_from_IInternetProtocol(iface);
+    MimeHtmlProtocol *This = impl_from_IUnknown(iface);
     ULONG ref = InterlockedIncrement(&This->ref);
 
     TRACE("(%p) ref=%d\n", This, ref);
@@ -74,9 +77,9 @@ static ULONG WINAPI MimeHtmlProtocol_AddRef(IInternetProtocol *iface)
     return ref;
 }
 
-static ULONG WINAPI MimeHtmlProtocol_Release(IInternetProtocol *iface)
+static ULONG WINAPI MimeHtmlProtocol_Release(IUnknown *iface)
 {
-    MimeHtmlProtocol *This = impl_from_IInternetProtocol(iface);
+    MimeHtmlProtocol *This = impl_from_IUnknown(iface);
     ULONG ref = InterlockedDecrement(&This->ref);
 
     TRACE("(%p) ref=%x\n", This, ref);
@@ -87,6 +90,35 @@ static ULONG WINAPI MimeHtmlProtocol_Release(IInternetProtocol *iface)
     return ref;
 }
 
+static const IUnknownVtbl MimeHtmlProtocolInnerVtbl = {
+    MimeHtmlProtocol_QueryInterface,
+    MimeHtmlProtocol_AddRef,
+    MimeHtmlProtocol_Release
+};
+
+static inline MimeHtmlProtocol *impl_from_IInternetProtocol(IInternetProtocol *iface)
+{
+    return CONTAINING_RECORD(iface, MimeHtmlProtocol, IInternetProtocol_iface);
+}
+
+static HRESULT WINAPI InternetProtocol_QueryInterface(IInternetProtocol *iface, REFIID riid, void **ppv)
+{
+    MimeHtmlProtocol *This = impl_from_IInternetProtocol(iface);
+    return IUnknown_QueryInterface(This->outer_unk, riid, ppv);
+}
+
+static ULONG WINAPI InternetProtocol_AddRef(IInternetProtocol *iface)
+{
+    MimeHtmlProtocol *This = impl_from_IInternetProtocol(iface);
+    return IUnknown_AddRef(This->outer_unk);
+}
+
+static ULONG WINAPI InternetProtocol_Release(IInternetProtocol *iface)
+{
+    MimeHtmlProtocol *This = impl_from_IInternetProtocol(iface);
+    return IUnknown_Release(This->outer_unk);
+}
+
 static HRESULT WINAPI MimeHtmlProtocol_Start(IInternetProtocol *iface, const WCHAR *szUrl,
         IInternetProtocolSink* pOIProtSink, IInternetBindInfo* pOIBindInfo,
         DWORD grfPI, HANDLE_PTR dwReserved)
@@ -162,9 +194,9 @@ static HRESULT WINAPI MimeHtmlProtocol_UnlockRequest(IInternetProtocol *iface)
 }
 
 static const IInternetProtocolVtbl MimeHtmlProtocolVtbl = {
-    MimeHtmlProtocol_QueryInterface,
-    MimeHtmlProtocol_AddRef,
-    MimeHtmlProtocol_Release,
+    InternetProtocol_QueryInterface,
+    InternetProtocol_AddRef,
+    InternetProtocol_Release,
     MimeHtmlProtocol_Start,
     MimeHtmlProtocol_Continue,
     MimeHtmlProtocol_Abort,
@@ -185,19 +217,19 @@ static inline MimeHtmlProtocol *impl_from_IInternetProtocolInfo(IInternetProtoco
 static HRESULT WINAPI MimeHtmlProtocolInfo_QueryInterface(IInternetProtocolInfo *iface, REFIID riid, void **ppv)
 {
     MimeHtmlProtocol *This = impl_from_IInternetProtocolInfo(iface);
-    return IInternetProtocol_QueryInterface(&This->IInternetProtocol_iface, riid, ppv);
+    return IUnknown_QueryInterface(This->outer_unk, riid, ppv);
 }
 
 static ULONG WINAPI MimeHtmlProtocolInfo_AddRef(IInternetProtocolInfo *iface)
 {
     MimeHtmlProtocol *This = impl_from_IInternetProtocolInfo(iface);
-    return IInternetProtocol_AddRef(&This->IInternetProtocol_iface);
+    return IUnknown_AddRef(This->outer_unk);
 }
 
 static ULONG WINAPI MimeHtmlProtocolInfo_Release(IInternetProtocolInfo *iface)
 {
     MimeHtmlProtocol *This = impl_from_IInternetProtocolInfo(iface);
-    return IInternetProtocol_Release(&This->IInternetProtocol_iface);
+    return IUnknown_Release(This->outer_unk);
 }
 
 static HRESULT WINAPI MimeHtmlProtocolInfo_ParseUrl(IInternetProtocolInfo *iface, LPCWSTR pwzUrl,
@@ -253,17 +285,16 @@ HRESULT MimeHtmlProtocol_create(IUnknown *outer, void **obj)
 {
     MimeHtmlProtocol *protocol;
 
-    if(outer)
-        FIXME("outer not supported\n");
-
     protocol = heap_alloc(sizeof(*protocol));
     if(!protocol)
         return E_OUTOFMEMORY;
 
+    protocol->IUnknown_inner.lpVtbl = &MimeHtmlProtocolInnerVtbl;
     protocol->IInternetProtocol_iface.lpVtbl = &MimeHtmlProtocolVtbl;
     protocol->IInternetProtocolInfo_iface.lpVtbl = &MimeHtmlProtocolInfoVtbl;
     protocol->ref = 1;
+    protocol->outer_unk = outer ? outer : &protocol->IUnknown_inner;
 
-    *obj = &protocol->IInternetProtocol_iface;
+    *obj = &protocol->IUnknown_inner;
     return S_OK;
 }
diff --git a/dlls/inetcomm/tests/mimeole.c b/dlls/inetcomm/tests/mimeole.c
index 7d68a253d8d..924e0e32847 100644
--- a/dlls/inetcomm/tests/mimeole.c
+++ b/dlls/inetcomm/tests/mimeole.c
@@ -772,8 +772,32 @@ static void test_mhtml_protocol_info(void)
     IInternetProtocolInfo_Release(protocol_info);
 }
 
+static HRESULT WINAPI outer_QueryInterface(IUnknown *iface, REFIID riid, void **ppv)
+{
+    ok(0, "unexpected call\n");
+    return E_NOINTERFACE;
+}
+
+static ULONG WINAPI outer_AddRef(IUnknown *iface)
+{
+    return 2;
+}
+
+static ULONG WINAPI outer_Release(IUnknown *iface)
+{
+    return 1;
+}
+
+static const IUnknownVtbl outer_vtbl = {
+    outer_QueryInterface,
+    outer_AddRef,
+    outer_Release
+};
+
 static void test_mhtml_protocol(void)
 {
+    IUnknown outer = { &outer_vtbl };
+    IClassFactory *class_factory;
     IUnknown *unk, *unk2;
     HRESULT hres;
 
@@ -781,15 +805,25 @@ static void test_mhtml_protocol(void)
     hres = CoGetClassObject(&CLSID_IMimeHtmlProtocol, CLSCTX_INPROC_SERVER, NULL, &IID_IUnknown, (void**)&unk);
     ok(hres == S_OK, "CoGetClassObject failed: %08x\n", hres);
 
-    hres = IUnknown_QueryInterface(unk, &IID_IClassFactory, (void**)&unk2);
-    ok(hres == S_OK, "Could not get IClassFactory iface: %08x\n", hres);
-    IUnknown_Release(unk2);
-
     hres = IUnknown_QueryInterface(unk, &IID_IInternetProtocolInfo, (void**)&unk2);
     ok(hres == E_NOINTERFACE, "IInternetProtocolInfo supported\n");
 
+    hres = IUnknown_QueryInterface(unk, &IID_IClassFactory, (void**)&class_factory);
+    ok(hres == S_OK, "Could not get IClassFactory iface: %08x\n", hres);
     IUnknown_Release(unk);
 
+    hres = IClassFactory_CreateInstance(class_factory, &outer, &IID_IUnknown, (void**)&unk);
+    ok(hres == S_OK, "CreateInstance returned: %08x\n", hres);
+    hres = IUnknown_QueryInterface(unk, &IID_IInternetProtocol, (void**)&unk2);
+    ok(hres == S_OK, "Coult not get IInternetProtocol iface: %08x\n", hres);
+    IUnknown_Release(unk2);
+    IUnknown_Release(unk);
+
+    hres = IClassFactory_CreateInstance(class_factory, (IUnknown*)0xdeadbeef, &IID_IInternetProtocol, (void**)&unk2);
+    ok(hres == CLASS_E_NOAGGREGATION, "CreateInstance returned: %08x\n", hres);
+
+    IClassFactory_Release(class_factory);
+
     test_mhtml_protocol_info();
 }