diff --git a/kal/posix/include/signal.h b/kal/posix/include/signal.h
index d3ab2d78..c3848a98 100755
--- a/kal/posix/include/signal.h
+++ b/kal/posix/include/signal.h
@@ -10,6 +10,7 @@ extern "C" {
 #endif
 
 #define __NEED_pthread_attr_t
+#define __NEED_time_t
 
 #include <bits/alltypes.h>
 
diff --git a/kal/posix/include/time.h b/kal/posix/include/time.h
index e03764da..14e68b7e 100644
--- a/kal/posix/include/time.h
+++ b/kal/posix/include/time.h
@@ -3,6 +3,10 @@
 
 #ifdef __ICCARM__ /* for iar */
 
+#if !defined(_DLIB_TIME_USES_64) || !defined(_DLIB_TIME_USES_LONG) || (_DLIB_TIME_USES_64 == 0) || (_DLIB_TIME_USES_LONG == 0)
+#error "_DLIB_TIME_USES_64=1 and _DLIB_TIME_USES_LONG=1 should be defined in IAR project(C/C++ Compiler->Preprocessor->Defined symbols)."
+#endif
+
 #ifndef tm_isdst
 #define tm_isdst    tm_isdst;	\
 	long __tm_gmtoff;	\