diff --git a/dlls/mshtml/binding.h b/dlls/mshtml/binding.h
index dfb14cf1f34..697370af2e1 100644
--- a/dlls/mshtml/binding.h
+++ b/dlls/mshtml/binding.h
@@ -114,3 +114,4 @@ HRESULT create_channelbsc(IMoniker*,const WCHAR*,BYTE*,DWORD,nsChannelBSC**) DEC
 HRESULT channelbsc_load_stream(nsChannelBSC*,IStream*) DECLSPEC_HIDDEN;
 void channelbsc_set_channel(nsChannelBSC*,nsChannel*,nsIStreamListener*,nsISupports*) DECLSPEC_HIDDEN;
 IUri *nsuri_get_uri(nsWineURI*) DECLSPEC_HIDDEN;
+HRESULT create_relative_uri(HTMLWindow*,const WCHAR*,IUri**) DECLSPEC_HIDDEN;
diff --git a/dlls/mshtml/htmlwindow.c b/dlls/mshtml/htmlwindow.c
index 25fd1cec313..67cf3fb55a9 100644
--- a/dlls/mshtml/htmlwindow.c
+++ b/dlls/mshtml/htmlwindow.c
@@ -814,10 +814,7 @@ static HRESULT WINAPI HTMLWindow2_open(IHTMLWindow2 *iface, BSTR url, BSTR name,
         return S_OK;
     }
 
-    if(This->uri)
-        hres = CoInternetCombineUrlEx(This->uri, url, URL_ESCAPE_SPACES_ONLY|URL_DONT_ESCAPE_EXTRA_INFO, &uri, 0);
-    else
-        hres = CreateUri(url, 0, 0, &uri);
+    hres = create_relative_uri(This, url, &uri);
     if(FAILED(hres))
         return hres;
 
diff --git a/dlls/mshtml/persist.c b/dlls/mshtml/persist.c
index 6cb7b729a00..f1310628d88 100644
--- a/dlls/mshtml/persist.c
+++ b/dlls/mshtml/persist.c
@@ -175,6 +175,13 @@ void set_current_mon(HTMLWindow *This, IMoniker *mon)
     set_script_mode(This, use_gecko_script(This) ? SCRIPTMODE_GECKO : SCRIPTMODE_ACTIVESCRIPT);
 }
 
+HRESULT create_relative_uri(HTMLWindow *window, const WCHAR *rel_uri, IUri **uri)
+{
+    return window->uri
+        ? CoInternetCombineUrlEx(window->uri, rel_uri, URL_ESCAPE_SPACES_ONLY|URL_DONT_ESCAPE_EXTRA_INFO, uri, 0)
+        : CreateUri(rel_uri, 0, 0, uri);
+}
+
 void set_download_state(HTMLDocumentObj *doc, int state)
 {
     if(doc->client) {