diff --git a/reactos/include/psdk/winnt.h b/reactos/include/psdk/winnt.h
index bcf70a22029..7197b5a34af 100644
--- a/reactos/include/psdk/winnt.h
+++ b/reactos/include/psdk/winnt.h
@@ -2210,11 +2210,6 @@ typedef struct _CONTEXT {
 } CONTEXT;
 #elif defined(__x86_64__)
 
-#define UNW_FLAG_NHANDLER  0
-#define UNW_FLAG_EHANDLER  1
-#define UNW_FLAG_UHANDLER  2
-#define UNW_FLAG_CHAININFO 4
-
 #define CONTEXT_AMD64 0x100000
 
 #if !defined(RC_INVOKED)