diff --git a/include/os.h b/include/os.h
index efa202c6c..e882a0cf6 100644
--- a/include/os.h
+++ b/include/os.h
@@ -441,29 +441,6 @@ extern _X_EXPORT int ddxProcessArgument(int /*argc*/, char * /*argv*/ [], int /*
 
 extern _X_EXPORT void ddxUseMsg(void);
 
-/* int ReqLen(xReq *req, ClientPtr client)
- * Given a pointer to a *complete* request, return its length in bytes.
- * Note that if the request is a big request (as defined in the Big
- * Requests extension), the macro lies by returning 4 less than the
- * length that it actually occupies in the request buffer.  This is so you
- * can blindly compare the length with the various sz_<request> constants
- * in Xproto.h without having to know/care about big requests.
- */
-#define ReqLen(_pxReq, _client) \
- ((_pxReq->length ? \
-     (_client->swapped ? lswaps(_pxReq->length) : _pxReq->length) \
-  : ((_client->swapped ? \
-	lswapl(((CARD32*)_pxReq)[1]) : ((CARD32*)_pxReq)[1])-1) \
-  ) << 2)
-
-/* otherReqTypePtr CastxReq(xReq *req, otherReqTypePtr)
- * Cast the given request to one of type otherReqTypePtr to access
- * fields beyond the length field.
- */
-#define CastxReq(_pxReq, otherReqTypePtr) \
-    (_pxReq->length ? (otherReqTypePtr)_pxReq \
-		    : (otherReqTypePtr)(((CARD32*)_pxReq)+1))
-
 /* stuff for ReplyCallback */
 extern _X_EXPORT CallbackListPtr ReplyCallback;
 typedef struct {