diff --git a/include/wtypes.h b/include/wtypes.h
index 0ecde4f2f32..2e8b93dc4d7 100644
--- a/include/wtypes.h
+++ b/include/wtypes.h
@@ -9,12 +9,6 @@ extern "C" {
 #endif
 #include "basetsd.h"
 #include "guiddef.h"
-typedef CHAR OLECHAR16;
-typedef LPSTR LPOLESTR16;
-typedef LPCSTR LPCOLESTR16;
-typedef OLECHAR16 *BSTR16;
-typedef BSTR16 *LPBSTR16;
-#define OLESTR16(x) x
 #if 0 /* winnt.h */
 typedef unsigned char BYTE;
 
@@ -160,6 +154,15 @@ typedef const OLECHAR *LPCOLESTR;
 #ifndef __WINE__
 #define OLESTR(str) WINE_UNICODE_TEXT(str)
 #endif
+typedef CHAR OLECHAR16;
+
+typedef LPSTR LPOLESTR16;
+
+typedef LPCSTR LPCOLESTR16;
+
+typedef OLECHAR16 *BSTR16;
+typedef BSTR16 *LPBSTR16;
+#define OLESTR16(x) x
 typedef LONG SCODE;
 
 typedef struct _COAUTHIDENTITY {
diff --git a/include/wtypes.idl b/include/wtypes.idl
index 07976c90d4f..9fa0295c6bd 100644
--- a/include/wtypes.idl
+++ b/include/wtypes.idl
@@ -31,15 +31,6 @@ interface IWinTypes
 cpp_quote("#include \"basetsd.h\"")
 cpp_quote("#include \"guiddef.h\"")
 
-/* from Wine's pre-WIDL wtypes.h */
-/* FIXME: does not belong here */
-cpp_quote("typedef CHAR OLECHAR16;")
-cpp_quote("typedef LPSTR LPOLESTR16;")
-cpp_quote("typedef LPCSTR LPCOLESTR16;")
-cpp_quote("typedef OLECHAR16 *BSTR16;")
-cpp_quote("typedef BSTR16 *LPBSTR16;")
-cpp_quote("#define OLESTR16(x) x")
-
 /******************** BASIC WIN32 TYPES ********************/
 cpp_quote("#if 0 /* winnt.h */") /* don't redefine these */
 
@@ -166,6 +157,18 @@ cpp_quote("#ifndef __WINE__")
 cpp_quote("#define OLESTR(str) WINE_UNICODE_TEXT(str)")
 cpp_quote("#endif")
 
+/* from Wine's pre-WIDL wtypes.h */
+/* FIXME: does not belong here */
+typedef CHAR OLECHAR16;
+typedef LPSTR LPOLESTR16;
+typedef LPCSTR LPCOLESTR16;
+/* quoted because if BSTR16 is ever used in IDL files,
+ * it'll probably need some wire_marshal stuff too,
+ * and quoting these will detect any such necessity */
+cpp_quote("typedef OLECHAR16 *BSTR16;")
+cpp_quote("typedef BSTR16 *LPBSTR16;")
+cpp_quote("#define OLESTR16(x) x")
+
 typedef LONG SCODE;
 
 typedef struct _COAUTHIDENTITY {