diff --git a/include/winnt.h b/include/winnt.h
index be55d9c92b1..a2fcd43fda4 100644
--- a/include/winnt.h
+++ b/include/winnt.h
@@ -2460,6 +2460,7 @@ typedef struct _IMAGE_VXD_HEADER {
 #define	IMAGE_FILE_MACHINE_ARM		0x01c0
 #define	IMAGE_FILE_MACHINE_THUMB	0x01c2
 #define	IMAGE_FILE_MACHINE_ARMNT	0x01c4
+#define	IMAGE_FILE_MACHINE_ARM64	0xaa64
 #define	IMAGE_FILE_MACHINE_AM33		0x01d3
 #define	IMAGE_FILE_MACHINE_POWERPC	0x01f0
 #define	IMAGE_FILE_MACHINE_POWERPCFP	0x01f1
@@ -2476,9 +2477,6 @@ typedef struct _IMAGE_VXD_HEADER {
 #define	IMAGE_FILE_MACHINE_M32R		0x9041
 #define	IMAGE_FILE_MACHINE_CEE		0xc0ee
 
-/* Wine extension */
-#define	IMAGE_FILE_MACHINE_ARM64	0x01c5
-
 #define	IMAGE_SIZEOF_FILE_HEADER		20
 #define IMAGE_SIZEOF_ROM_OPTIONAL_HEADER	56
 #define IMAGE_SIZEOF_STD_OPTIONAL_HEADER	28
diff --git a/tools/winebuild/spec32.c b/tools/winebuild/spec32.c
index ae739d8a8ca..0ed38edd40d 100644
--- a/tools/winebuild/spec32.c
+++ b/tools/winebuild/spec32.c
@@ -37,8 +37,7 @@
 #define IMAGE_FILE_MACHINE_POWERPC 0x01f0
 #define IMAGE_FILE_MACHINE_AMD64   0x8664
 #define IMAGE_FILE_MACHINE_ARMNT   0x01C4
-/* Wine extension */
-#define IMAGE_FILE_MACHINE_ARM64   0x01C5
+#define IMAGE_FILE_MACHINE_ARM64   0xaa64
 
 #define IMAGE_SIZEOF_NT_OPTIONAL32_HEADER 224
 #define IMAGE_SIZEOF_NT_OPTIONAL64_HEADER 240