diff --git a/libcpu/arm/cortex-m33/trustzone.c b/libcpu/arm/cortex-m33/trustzone.c
index 86654a7199..5f37ddbb8f 100644
--- a/libcpu/arm/cortex-m33/trustzone.c
+++ b/libcpu/arm/cortex-m33/trustzone.c
@@ -10,11 +10,19 @@
 
 #include <rtthread.h>
 
+#ifdef ARM_CM33_ENABLE_TRUSTZONE
 extern void TZ_InitContextSystem_S(void);
 extern rt_uint32_t TZ_AllocModuleContext_S (rt_uint32_t module);
 extern rt_uint32_t TZ_FreeModuleContext_S(rt_uint32_t id);
 extern rt_uint32_t TZ_LoadContext_S(rt_uint32_t id);
 extern rt_uint32_t TZ_StoreContext_S(rt_uint32_t id);
+#else
+void TZ_InitContextSystem_S(void){}
+rt_uint32_t TZ_AllocModuleContext_S (rt_uint32_t module){return 0;}
+rt_uint32_t TZ_FreeModuleContext_S(rt_uint32_t id) {return 0;}
+rt_uint32_t TZ_LoadContext_S(rt_uint32_t id){return 0;};
+rt_uint32_t TZ_StoreContext_S(rt_uint32_t id){return 0;};
+#endif
 extern int tzcall(int id, rt_ubase_t arg0, rt_ubase_t arg1, rt_ubase_t arg2);
 
 #define TZ_INIT_CONTEXT_ID     (0x1001)