diff --git a/dlls/mshtml/main.c b/dlls/mshtml/main.c
index 1bb34de2775..f713e27ad05 100644
--- a/dlls/mshtml/main.c
+++ b/dlls/mshtml/main.c
@@ -224,6 +224,16 @@ HRESULT WINAPI DllInstall(BOOL bInstall, LPCWSTR cmdline)
     return S_OK;
 }
 
+/***********************************************************************
+ *          ShowHTMLDialog (MSHTML.@)
+ */
+HRESULT WINAPI ShowHTMLDialog(HWND hwndParent, IMoniker *pMk, VARIANT *pvarArgIn,
+        WCHAR *pchOptions, VARIANT *pvarArgOut)
+{
+    FIXME("(%p %p %p %s %p)\n", hwndParent, pMk, pvarArgIn, debugstr_w(pchOptions), pvarArgOut);
+    return E_NOTIMPL;
+}
+
 DEFINE_GUID(CLSID_CAnchorBrowsePropertyPage, 0x3050F3BB, 0x98B5, 0x11CF, 0xBB,0x82, 0x00,0xAA,0x00,0xBD,0xCE,0x0B);
 DEFINE_GUID(CLSID_CBackgroundPropertyPage, 0x3050F232, 0x98B5, 0x11CF, 0xBB,0x82, 0x00,0xAA,0x00,0xBD,0xCE,0x0B);
 DEFINE_GUID(CLSID_CCDAnchorPropertyPage, 0x3050F1FC, 0x98B5, 0x11CF, 0xBB,0x82, 0x00,0xAA,0x00,0xBD,0xCE,0x0B);
diff --git a/dlls/mshtml/mshtml.spec b/dlls/mshtml/mshtml.spec
index 705d559d649..c8e1be58c8c 100644
--- a/dlls/mshtml/mshtml.spec
+++ b/dlls/mshtml/mshtml.spec
@@ -9,7 +9,7 @@
 @ stub PrintHTML
 @ stdcall RNIGetCompatibleVersion()
 @ stdcall RunHTMLApplication(long long str long)
-@ stub ShowHTMLDialog
+@ stdcall ShowHTMLDialog(ptr ptr ptr wstr ptr)
 @ stub ShowModalDialog
 @ stub ShowModelessHTMLDialog
 @ stub SvrTri_ClearCache