diff --git a/bsp/imxrt1052-evk/applications/SConscript b/bsp/imxrt1052-evk/applications/SConscript
index 79416cbc8b..7725e3b910 100644
--- a/bsp/imxrt1052-evk/applications/SConscript
+++ b/bsp/imxrt1052-evk/applications/SConscript
@@ -7,9 +7,7 @@ src	= Glob('*.c')
 CPPPATH = [cwd, str(Dir('#'))]
 
 # add for startup script 
-if rtconfig.CROSS_TOOL == 'iar':
-    CPPDEFINES = ['_TIMESPEC_DEFINED']
-elif rtconfig.CROSS_TOOL == 'gcc':
+if rtconfig.CROSS_TOOL == 'gcc':
     CPPDEFINES = ['__START=entry']
 else:
     CPPDEFINES = []
diff --git a/bsp/lpc54608-LPCXpresso/applications/SConscript b/bsp/lpc54608-LPCXpresso/applications/SConscript
index ce22322176..01eb940dfb 100644
--- a/bsp/lpc54608-LPCXpresso/applications/SConscript
+++ b/bsp/lpc54608-LPCXpresso/applications/SConscript
@@ -6,12 +6,6 @@ cwd     = os.path.join(str(Dir('#')), 'applications')
 src	= Glob('*.c')
 CPPPATH = [cwd, str(Dir('#'))]
 
-# add for startup script 
-if rtconfig.CROSS_TOOL == 'iar':
-    CPPDEFINES = ['_TIMESPEC_DEFINED']
-else:
-    CPPDEFINES = []
-
-group = DefineGroup('Applications', src, depend = [''], CPPPATH = CPPPATH, CPPDEFINES=CPPDEFINES)
+group = DefineGroup('Applications', src, depend = [''], CPPPATH = CPPPATH)
 
 Return('group')
diff --git a/bsp/stm32f429-apollo/applications/SConscript b/bsp/stm32f429-apollo/applications/SConscript
index c9f4e204a4..52ec60a5c6 100644
--- a/bsp/stm32f429-apollo/applications/SConscript
+++ b/bsp/stm32f429-apollo/applications/SConscript
@@ -8,16 +8,10 @@ application.c
 startup.c
 """)
 
-# add for startup script 
-if rtconfig.CROSS_TOOL == 'iar':
-    CPPDEFINES = ['_TIMESPEC_DEFINED']
-else:
-    CPPDEFINES = []
-
 # add UI engine demo.
 if GetDepend('RT_USING_GUIENGINE'):
     src += ['rtgui_demo.c']
 
-group = DefineGroup('Applications', src, depend = [''], CPPPATH = CPPPATH, CPPDEFINES=CPPDEFINES)
+group = DefineGroup('Applications', src, depend = [''], CPPPATH = CPPPATH)
 
 Return('group')
diff --git a/components/libc/compilers/dlib/sys/time.h b/components/libc/compilers/dlib/sys/time.h
index 2d60b37317..ac52745064 100644
--- a/components/libc/compilers/dlib/sys/time.h
+++ b/components/libc/compilers/dlib/sys/time.h
@@ -20,6 +20,10 @@ struct timeval {
 };
 #endif /* _TIMEVAL_DEFINED */
 
+#if defined ( __ICCARM__ ) && (__VER__ >= 8011002)
+#define _TIMESPEC_DEFINED
+#endif
+
 #ifndef _TIMESPEC_DEFINED
 #define _TIMESPEC_DEFINED
 /*