diff --git a/include/ntapi/bits/nt64/nt_thread_x86_64.h b/include/ntapi/bits/nt64/nt_thread_x86_64.h
index 2fb2376..281961d 100644
--- a/include/ntapi/bits/nt64/nt_thread_x86_64.h
+++ b/include/ntapi/bits/nt64/nt_thread_x86_64.h
@@ -88,6 +88,7 @@ typedef struct {
 	nt_m128a_t		uc_xmm13;			/* 0x270 */
 	nt_m128a_t		uc_xmm14;			/* 0x280 */
 	nt_m128a_t		uc_xmm15;			/* 0x290 */
+	nt_m128a_t		uc_xsave_reserved[6];		/* 0x2a0 */
 	nt_m128a_t		uc_vector_register[26];		/* 0x300 */
 	uintptr_t		uc_vector_control;		/* 0x4a0 */
 	uintptr_t		uc_debug_control;		/* 0x4a8 */