--- Libc/Libc-391/pthreads/sched.h
+++ Libc/Libc-583/pthreads/sched.h
@@ -32,7 +32,7 @@
  * Scheduling paramters
  */
 #ifndef __POSIX_LIB__
-struct sched_param { int sched_priority;  char opaque[__SCHED_PARAM_SIZE__]; };
+struct sched_param { int sched_priority;  char __opaque[__SCHED_PARAM_SIZE__]; };
 #endif
 
 extern int sched_yield(void);