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-rw-r--r--extmod/moduplatform.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/extmod/moduplatform.h b/extmod/moduplatform.h
index d911d33dd..42ed4de24 100644
--- a/extmod/moduplatform.h
+++ b/extmod/moduplatform.h
@@ -37,7 +37,7 @@
#if defined(__ARM_ARCH)
#define MICROPY_PLATFORM_ARCH "arm"
-#elif defined(__x86_64__) || defined(_WIN64)
+#elif defined(__x86_64__) || defined(_M_X64)
#define MICROPY_PLATFORM_ARCH "x86_64"
#elif defined(__i386__) || defined(_M_IX86)
#define MICROPY_PLATFORM_ARCH "x86"