diff --git a/include/objidl.idl b/include/objidl.idl
index 02de2ef12ef..aa249de4865 100644
--- a/include/objidl.idl
+++ b/include/objidl.idl
@@ -435,10 +435,10 @@ interface IRunnableObject : IUnknown
 }
 
 /* GetObject is defined in wingdi.h as WINELIB_NAME_AW(GetObject),
- * which resolves to a compilation failure if __WINESRC__ is defined,
+ * which resolves to a compilation failure if WINE_NO_UNICODE_MACROS is defined,
  * but GetObject is used as a valid method name below, so we have
- * to undefine it if __WINESRC__ is defined */
-cpp_quote("#ifdef __WINESRC__")
+ * to undefine it in that case */
+cpp_quote("#ifdef WINE_NO_UNICODE_MACROS")
 cpp_quote("#undef GetObject")
 cpp_quote("#endif")
 
diff --git a/include/ocidl.idl b/include/ocidl.idl
index fbdb00d75ad..8cfaf5e9b21 100644
--- a/include/ocidl.idl
+++ b/include/ocidl.idl
@@ -514,7 +514,7 @@ interface IProvideClassInfo : IUnknown
 {
     typedef IProvideClassInfo *LPPROVIDECLASSINFO;
 
-cpp_quote("#ifdef __WINESRC__")
+cpp_quote("#ifdef WINE_NO_UNICODE_MACROS")
 cpp_quote("#undef GetClassInfo")
 cpp_quote("#endif")
 
diff --git a/include/oleidl.idl b/include/oleidl.idl
index be323f624ac..c9e8aa02e6d 100644
--- a/include/oleidl.idl
+++ b/include/oleidl.idl
@@ -97,7 +97,7 @@ interface IOleInPlaceObject : IOleWindow
 
 
 /* avoid conflict with Wine Unicode macros */
-cpp_quote("#ifdef __WINESRC__")
+cpp_quote("#ifdef WINE_NO_UNICODE_MACROS")
 cpp_quote("#undef TranslateAccelerator")
 cpp_quote("#endif")
 
@@ -335,7 +335,7 @@ interface IOleItemContainer : IOleContainer
 	OLECONTF_ONLYIFRUNNING = 16
     } OLECONTF;
 
-cpp_quote("#ifdef __WINESRC__")
+cpp_quote("#ifdef WINE_NO_UNICODE_MACROS")
 cpp_quote("#undef GetObject")
 cpp_quote("#endif")
     HRESULT GetObject(
diff --git a/include/windef.h b/include/windef.h
index 8724e6239e1..c9f64cd3213 100644
--- a/include/windef.h
+++ b/include/windef.h
@@ -184,22 +184,26 @@ typedef char                        *PSZ;
 /* Note that Winelib is purely Win32.                             */
 
 #ifdef __WINESRC__
+#define WINE_NO_UNICODE_MACROS
+#endif
+
+#ifdef WINE_NO_UNICODE_MACROS
 # define WINELIB_NAME_AW(func) \
     func##_must_be_suffixed_with_W_or_A_in_this_context \
     func##_must_be_suffixed_with_W_or_A_in_this_context
-#else  /* __WINESRC__ */
+#else  /* WINE_NO_UNICODE_MACROS */
 # ifdef UNICODE
 #  define WINELIB_NAME_AW(func) func##W
 # else
 #  define WINELIB_NAME_AW(func) func##A
-# endif  /* UNICODE */
-#endif  /* __WINESRC__ */
+# endif
+#endif  /* WINE_NO_UNICODE_MACROS */
 
-#ifdef __WINESRC__
+#ifdef WINE_NO_UNICODE_MACROS
 # define DECL_WINELIB_TYPE_AW(type)  /* nothing */
-#else   /* __WINESRC__ */
+#else
 # define DECL_WINELIB_TYPE_AW(type)  typedef WINELIB_NAME_AW(type) type;
-#endif  /* __WINESRC__ */
+#endif
 
 #include <winnt.h>