diff --git a/src/libsodium/sodium/runtime.c b/src/libsodium/sodium/runtime.c
index 8ecb7fe6..6e98f21b 100644
--- a/src/libsodium/sodium/runtime.c
+++ b/src/libsodium/sodium/runtime.c
@@ -149,7 +149,7 @@ _sodium_runtime_intel_cpu_features(CPUFeatures * const cpu_features)
     if ((cpu_info[2] & (CPUID_ECX_AVX | CPUID_ECX_XSAVE | CPUID_ECX_OSXSAVE)) ==
         (CPUID_ECX_AVX | CPUID_ECX_XSAVE | CPUID_ECX_OSXSAVE)) {
         uint32_t xcr0 = 0U;
-# ifdef _MSC_VER
+# if defined(_MSC_VER) && defined(_M_IX86)
         __asm {
             xor ecx, ecx
             _asm _emit 0x0f _asm _emit 0x01 _asm _emit 0xd0