diff --git a/include/objidl.idl b/include/objidl.idl
index 39f8c541eda..502214839c5 100644
--- a/include/objidl.idl
+++ b/include/objidl.idl
@@ -516,6 +516,7 @@ interface IMoniker : IPersistStream
     MKSYS_ANTIMONIKER      = 3,
     MKSYS_ITEMMONIKER      = 4,
     MKSYS_POINTERMONIKER   = 5,
+    /* MKSYS_URLMONIKER       = 6, */ /* defined in urlmon.idl */
     MKSYS_CLASSMONIKER     = 7
   } MKSYS;
 
diff --git a/include/urlmon.h b/include/urlmon.h
index b935b76d5e7..98e20256c51 100644
--- a/include/urlmon.h
+++ b/include/urlmon.h
@@ -1391,6 +1391,7 @@ HRESULT WINAPI CoInternetGetSession(DWORD,/*IInternetSession*/void**,DWORD);
 HRESULT WINAPI MkParseDisplayNameEx(IBindCtx*,LPCWSTR,ULONG*,IMoniker**);
 HRESULT WINAPI IsAsyncMoniker(IMoniker* pmk);
 HRESULT WINAPI CreateAsyncBindCtx(DWORD, IBindStatusCallback*, IEnumFORMATETC*, IBindCtx**);
+#define MKSYS_URLMONIKER 6
 #ifdef __cplusplus
 }
 #endif
diff --git a/include/urlmon.idl b/include/urlmon.idl
index 65cea8fd51c..a081f292fc0 100644
--- a/include/urlmon.idl
+++ b/include/urlmon.idl
@@ -543,3 +543,4 @@ cpp_quote("HRESULT WINAPI CoInternetGetSession(DWORD,/*IInternetSession*/void**,
 cpp_quote("HRESULT WINAPI MkParseDisplayNameEx(IBindCtx*,LPCWSTR,ULONG*,IMoniker**);")
 cpp_quote("HRESULT WINAPI IsAsyncMoniker(IMoniker* pmk);")
 cpp_quote("HRESULT WINAPI CreateAsyncBindCtx(DWORD, IBindStatusCallback*, IEnumFORMATETC*, IBindCtx**);")
+cpp_quote("#define MKSYS_URLMONIKER 6")