diff --git a/include/rpcsvc/yp_prot.h b/include/rpcsvc/yp_prot.h
--- a/include/rpcsvc/yp_prot.h
+++ b/include/rpcsvc/yp_prot.h
@@ -67,11 +67,6 @@
  * YPPROC_MAPLIST	takes (char *), returns (struct ypmaplist *).
  */
 
-#ifndef BOOL_DEFINED
-typedef u_int bool;
-#define BOOL_DEFINED
-#endif
-
 /* Program and version symbols, magic numbers */
 
 #define YPPROG		((u_long)100004)