diff --git a/include/rtdef.h b/include/rtdef.h
index 1105c5dc10da475f910ced8c9b47c5879ebf3a90..9aaf90b714c53c2e07a806e2dab97bb2a338bb2f 100644
--- a/include/rtdef.h
+++ b/include/rtdef.h
@@ -161,6 +161,7 @@ typedef rt_base_t                       rt_off_t;       /**< Type for offset */
     #define rt_inline                   static __inline
     #define RTT_API
 #elif defined (__TI_COMPILER_VERSION__)
+    #include <stdarg.h>
     /* The way that TI compiler set section is different from other(at least
      * GCC and MDK) compilers. See ARM Optimizing C/C++ Compiler 5.9.3 for more
      * details. */