diff --git a/mingw-w64-headers/include/mshtmhst.idl b/mingw-w64-headers/include/mshtmhst.idl
index 48ab58d..a23c39e 100644
--- a/mingw-w64-headers/include/mshtmhst.idl
+++ b/mingw-w64-headers/include/mshtmhst.idl
@@ -79,7 +79,7 @@
 cpp_quote("STDAPI RunHTMLApplication (HINSTANCE hinst, HINSTANCE hPrevInst, LPSTR szCmdLine, int nCmdShow);")
 cpp_quote("#endif")
 cpp_quote("STDAPI CreateHTMLPropertyPage (IMoniker *pmk, IPropertyPage **ppPP);")
-cpp_quote("STDAPI EarlyStartDisplaySystem ();")
+cpp_quote("STDAPI EarlyStartDisplaySystem (void);")
 cpp_quote("STDAPI IERegisterXMLNS (LPCWSTR lpszURI, GUID clsid, BOOL fMachine);")
 cpp_quote("STDAPI IEIsXMLNSRegistered (LPCWSTR lpszURI, GUID *pCLSID);")
 cpp_quote("STDAPI GetColorValueFromString (LPCWSTR lpszColor, BOOL fStrictCSS1, BOOL fIsStandardsCSS, COLORREF *pColor);")