diff --git a/core/include/sys/types.h b/core/include/sys/types.h
index 7f6a228..748d08d 100644
--- a/core/include/sys/types.h
+++ b/core/include/sys/types.h
@@ -2,6 +2,11 @@
 
 #include <stdint.h>
 
+#if !defined(IN_LIMITS)
+#define IN_LIMITS(v,min,max)	( (min<=v) && (v <= max) )
+#endif
+
+
 typedef int32_t APICALL;
 
 typedef struct {