diff --git a/c/src/exec/posix/headers/threadsup.h b/c/src/exec/posix/headers/threadsup.h
index e886fdf31f..bb800a507f 100644
--- a/c/src/exec/posix/headers/threadsup.h
+++ b/c/src/exec/posix/headers/threadsup.h
@@ -15,6 +15,7 @@ typedef struct {
   Thread_queue_Control    Join_List;
   int                     schedpolicy;
   struct sched_param      schedparam;
+  int                     ss_high_priority;
   Watchdog_Control        Sporadic_timer;
 
   sigset_t                signals_blocked;
diff --git a/c/src/exec/posix/include/rtems/posix/threadsup.h b/c/src/exec/posix/include/rtems/posix/threadsup.h
index e886fdf31f..bb800a507f 100644
--- a/c/src/exec/posix/include/rtems/posix/threadsup.h
+++ b/c/src/exec/posix/include/rtems/posix/threadsup.h
@@ -15,6 +15,7 @@ typedef struct {
   Thread_queue_Control    Join_List;
   int                     schedpolicy;
   struct sched_param      schedparam;
+  int                     ss_high_priority;
   Watchdog_Control        Sporadic_timer;
 
   sigset_t                signals_blocked;
diff --git a/cpukit/posix/include/rtems/posix/threadsup.h b/cpukit/posix/include/rtems/posix/threadsup.h
index e886fdf31f..bb800a507f 100644
--- a/cpukit/posix/include/rtems/posix/threadsup.h
+++ b/cpukit/posix/include/rtems/posix/threadsup.h
@@ -15,6 +15,7 @@ typedef struct {
   Thread_queue_Control    Join_List;
   int                     schedpolicy;
   struct sched_param      schedparam;
+  int                     ss_high_priority;
   Watchdog_Control        Sporadic_timer;
 
   sigset_t                signals_blocked;