diff --git a/win32/include/winapi/winnt.h b/win32/include/winapi/winnt.h
index 27e2895b..b5ef864a 100644
--- a/win32/include/winapi/winnt.h
+++ b/win32/include/winapi/winnt.h
@@ -2070,59 +2070,6 @@ typedef DWORD LCID;
       DWORD64 ExceptionInformation[EXCEPTION_MAXIMUM_PARAMETERS];
     } EXCEPTION_RECORD64,*PEXCEPTION_RECORD64;
 
-#if defined(__aarch64__) && !defined(_ARM64_CONTEXT_DECLARED)
-#define _ARM64_CONTEXT_DECLARED
-    typedef struct DECLSPEC_ALIGN(16) _CONTEXT {
-      ULONG ContextFlags;
-      ULONG Cpsr;
-      union {
-        struct {
-          DWORD64 X0;
-          DWORD64 X1;
-          DWORD64 X2;
-          DWORD64 X3;
-          DWORD64 X4;
-          DWORD64 X5;
-          DWORD64 X6;
-          DWORD64 X7;
-          DWORD64 X8;
-          DWORD64 X9;
-          DWORD64 X10;
-          DWORD64 X11;
-          DWORD64 X12;
-          DWORD64 X13;
-          DWORD64 X14;
-          DWORD64 X15;
-          DWORD64 X16;
-          DWORD64 X17;
-          DWORD64 X18;
-          DWORD64 X19;
-          DWORD64 X20;
-          DWORD64 X21;
-          DWORD64 X22;
-          DWORD64 X23;
-          DWORD64 X24;
-          DWORD64 X25;
-          DWORD64 X26;
-          DWORD64 X27;
-          DWORD64 X28;
-          DWORD64 Fp;
-          DWORD64 Lr;
-        } DUMMYSTRUCTNAME;
-        DWORD64 X[31];
-      } DUMMYUNIONNAME;
-      DWORD64 Sp;
-      DWORD64 Pc;
-      ARM64_NT_NEON128 V[32];
-      DWORD Fpcr;
-      DWORD Fpsr;
-      DWORD Bcr[8];
-      DWORD64 Bvr[8];
-      DWORD Wcr[2];
-      DWORD64 Wvr[2];
-    } CONTEXT,*PCONTEXT;
-#endif
-
     typedef struct _EXCEPTION_POINTERS {
       PEXCEPTION_RECORD ExceptionRecord;
       PCONTEXT ContextRecord;