diff --git a/dlls/urlmon/uri.c b/dlls/urlmon/uri.c
index 49368b1f984..99906d20647 100644
--- a/dlls/urlmon/uri.c
+++ b/dlls/urlmon/uri.c
@@ -5588,3 +5588,13 @@ HRESULT WINAPI CreateIUriBuilder(IUri *pIUri, DWORD dwFlags, DWORD_PTR dwReserve
     *ppIUriBuilder = URIBUILDER(ret);
     return S_OK;
 }
+
+/***********************************************************************
+ *           CoInternetCombineIUri (urlmon.@)
+ */
+HRESULT WINAPI CoInternetCombineIUri(IUri *pBaseUri, IUri *pRelativeUri, DWORD dwCombineFlags,
+                                     IUri **ppCombinedUri, DWORD_PTR dwReserved)
+{
+    FIXME("(%p %p %x %p %x): stub\n", pBaseUri, pRelativeUri, dwCombineFlags, ppCombinedUri, (DWORD)dwReserved);
+    return E_NOTIMPL;
+}
diff --git a/dlls/urlmon/urlmon.spec b/dlls/urlmon/urlmon.spec
index 61093850d24..ff1adeaca49 100644
--- a/dlls/urlmon/urlmon.spec
+++ b/dlls/urlmon/urlmon.spec
@@ -12,6 +12,7 @@
 @ stub CoInstall
 @ stdcall CoInternetCombineUrl(wstr wstr long wstr long ptr long)
 @ stdcall CoInternetCompareUrl(wstr wstr long)
+@ stdcall CoInternetCombineIUri(ptr ptr long ptr long)
 @ stdcall CoInternetCreateSecurityManager(ptr ptr long)
 @ stdcall CoInternetCreateZoneManager(ptr ptr long)
 @ stub CoInternetGetProtocolFlags
diff --git a/include/urlmon.idl b/include/urlmon.idl
index b09eba3c986..e50975d7af3 100644
--- a/include/urlmon.idl
+++ b/include/urlmon.idl
@@ -1931,6 +1931,7 @@ cpp_quote("HRESULT WINAPI CreateAsyncBindCtxEx(IBindCtx*,DWORD,IBindStatusCallba
 cpp_quote("HRESULT WINAPI CoInternetCreateSecurityManager(IServiceProvider*,IInternetSecurityManager**,DWORD);")
 cpp_quote("HRESULT WINAPI CoInternetCombineUrl(LPCWSTR,LPCWSTR,DWORD,LPWSTR,DWORD,DWORD*,DWORD);")
 cpp_quote("HRESULT WINAPI CoInternetCompareUrl(LPCWSTR,LPCWSTR,DWORD);")
+cpp_quote("HRESULT WINAPI CoInternetCombineIUri(IUri*,IUri*,DWORD,IUri**,DWORD_PTR);")
 cpp_quote("HRESULT WINAPI CoInternetCreateZoneManager(IServiceProvider*, IInternetZoneManager**, DWORD);")
 cpp_quote("HRESULT WINAPI CoInternetParseUrl(LPCWSTR,PARSEACTION,DWORD,LPWSTR,DWORD,DWORD*,DWORD);")
 cpp_quote("HRESULT WINAPI CoInternetQueryInfo(LPCWSTR,QUERYOPTION,DWORD,LPVOID,DWORD,DWORD*,DWORD);")