diff --git a/core/mac/src/sys/legacy/src/system/inc/sys_def.h b/core/mac/src/sys/legacy/src/system/inc/sys_def.h
index 2de3ae86c97e3..640b25031f55f 100644
--- a/core/mac/src/sys/legacy/src/system/inc/sys_def.h
+++ b/core/mac/src/sys/legacy/src/system/inc/sys_def.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2011-2014 The Linux Foundation. All rights reserved.
+ * Copyright (c) 2011-2014, 2018 The Linux Foundation. All rights reserved.
  *
  * Permission to use, copy, modify, and/or distribute this software for
  * any purpose with or without fee is hereby granted, provided that the
@@ -40,120 +40,13 @@
 /* / System timer tick duration in milliseconds */
 #define SYS_TICK_DUR_MS     (SYS_TICK_DUR_NS/1000000)
 
-/* / Clocks in a millisecond */
-#define SYS_CLOCKS_PER_MS   120000      /* 120 MHz */
-
-/* / System timer tick duration in clocks */
-#define SYS_TICK_DUR_CLK    (SYS_TICK_DUR_MS * SYS_CLOCKS_PER_MS)
-
-/* / Number of timer ticks in a second */
-#define SYS_TICKS_PER_SECOND (1000/SYS_TICK_DUR_MS)
-
 /* / Macro to convert MS to Ticks */
 #define SYS_MS_TO_TICKS(x)   ((x) / SYS_TICK_DUR_MS)
 
-/* / Macro to convert Seconds to Ticks */
-#define SYS_SEC_TO_TICKS(x)  ((x) * SYS_TICKS_PER_SECOND)
-
-/* / Macro to convert Minutes to Ticks */
-#define SYS_MIN_TO_TICKS(x)  (((x) * 60) * SYS_TICKS_PER_SECOND)
-
-/* / MNT task processing interval in seconds */
-#define SYS_MNT_INTERVAL     60
-
 /* / MS to Time Units */
 #define SYS_MS_TO_TU(x)      ((x * 1000) >> 10)
 
 /* / TU to MS */
 #define SYS_TU_TO_MS(x)      ((x << 10) / 1000)
 
-/* ---------  End of Windows & RTAI ----------- */
-
-/* / Message queue definitions */
-
-/* / gHalMsgQ */
-#define SYS_HAL_Q_SIZE     200  /* Holds up to 25 messages */
-
-/* / gMMHhiPriorityMsgQ */
-#define SYS_MMH_HI_PRI_Q_SIZE      200  /* Holds up to 25 messages */
-
-/* / gMMHprotocolMsgQ */
-#define SYS_MMH_PROT_Q_SIZE     400     /* Holds up to 50 messages */
-
-/* / gMMHdebugMsgQ */
-#define SYS_MMH_DEBUG_Q_SIZE    800     /* Holds up to 100 messages */
-
-/* / gMAINTmsgQ */
-#define SYS_MNT_Q_SIZE          200     /* Holds up to 25 messages */
-
-/* / LIM Message Queue */
-#define SYS_LIM_Q_SIZE          400     /* Holds up to 50 messages */
-
-/* / Scheduler Message Queue */
-#define SYS_SCH_Q_SIZE          800     /* Holds up to 25 messages */
-
-/* / PMM Message Queue */
-#define SYS_PMM_Q_SIZE          800     /* Holds up to 100 messages */
-
-/* / TX Message Queue */
-#define SYS_TX_Q_SIZE           2048    /* Holds up to 400 messages */
-
-/* / RX Message Queue */
-#define SYS_RX_Q_SIZE           2048    /* Holds up to 400 messages */
-
-/* / PTT  Message Queue */
-#define SYS_NIM_PTT_Q_SIZE   200        /* Holds up to 25 messages */
-
-/* / Thread definitions */
-/* tHAL */
-
-#define SYS_HAL_THREAD_ENTRY_FUNCTION halEntry
-#define SYS_HAL_STACK_SIZE            8192
-#define SYS_HAL_THREAD_PRIORITY       2
-
-/* tDPH */
-
-#define SYS_DPH_THREAD_ENTRY_FUNCTION dphEntry
-#define SYS_DPH_STACK_SIZE            8192
-#define SYS_DPH_THREAD_PRIORITY       15
-
-/* tBBT */
-
-#define SYS_BBT_THREAD_ENTRY_FUNCTION bbtEntry
-#define SYS_BBT_STACK_SIZE            8192
-#define SYS_BBT_THREAD_PRIORITY       16
-
-/* tSCH */
-
-#define SYS_SCH_STACK_SIZE            8192
-#define SYS_SCH_THREAD_PRIORITY       17
-
-/* tPMM */
-
-#define SYS_PMM_STACK_SIZE            8192
-#define SYS_PMM_THREAD_PRIORITY       17
-
-/* tLIM */
-
-#define SYS_LIM_THREAD_ENTRY_FUNCTION limEntry
-#define SYS_LIM_STACK_SIZE            8192
-#define SYS_LIM_THREAD_PRIORITY       18
-
-/* tMAINT */
-
-#define SYS_MNT_THREAD_ENTRY_FUNCTION mntEntry
-#define SYS_MNT_STACK_SIZE            8192
-#define SYS_MNT_THREAD_PRIORITY       25
-
-/* tMMH */
-
-#define SYS_MMH_THREAD_ENTRY_FUNCTION mmhEntry
-#define SYS_MMH_STACK_SIZE            8192
-#define SYS_MMH_THREAD_PRIORITY        10
-
-/* tNIM_MNT_PKT_GEN */
-
-#define SYS_NIM_PTT_THREAD_STACK_SIZE 8192
-#define SYS_NIM_PTT_THREAD_PRIORITY   28
-
 #endif /* __SYSDEF_H */