diff --git a/core/sys/mt.h b/core/sys/mt.h
index f6296e24a..6db215084 100644
--- a/core/sys/mt.h
+++ b/core/sys/mt.h
@@ -183,18 +183,9 @@ void mtarch_pstop(void);
 
 struct mt_thread {
   int state;
-  process_event_t *evptr;
-  process_data_t *dataptr;
   struct mtarch_thread thread;
 };
 
-/**
- * No error.
- *
- * \hideinitializer
- */
-#define MT_OK 1
-
 /**
  * Initializes the multithreading library.
  *