diff --git a/xbyak/xbyak_util.h b/xbyak/xbyak_util.h
index de42bce..0886cbe 100644
--- a/xbyak/xbyak_util.h
+++ b/xbyak/xbyak_util.h
@@ -26,7 +26,7 @@
 #endif
 
 #ifdef XBYAK_INTEL_CPU_SPECIFIC
-#ifdef _WIN32
+#ifdef _MSC_VER
 	#if (_MSC_VER < 1400) && defined(XBYAK32)
 		static inline __declspec(naked) void __cpuid(int[4], int)
 		{
@@ -257,7 +257,7 @@
 	static inline void getCpuid(unsigned int eaxIn, unsigned int data[4])
 	{
 #ifdef XBYAK_INTEL_CPU_SPECIFIC
-	#ifdef _WIN32
+	#ifdef _MSC_VER
 		__cpuid(reinterpret_cast<int*>(data), eaxIn);
 	#else
 		__cpuid(eaxIn, data[0], data[1], data[2], data[3]);
@@ -270,7 +270,7 @@
 	static inline void getCpuidEx(unsigned int eaxIn, unsigned int ecxIn, unsigned int data[4])
 	{
 #ifdef XBYAK_INTEL_CPU_SPECIFIC
-	#ifdef _WIN32
+	#ifdef _MSC_VER
 		__cpuidex(reinterpret_cast<int*>(data), eaxIn, ecxIn);
 	#else
 		__cpuid_count(eaxIn, ecxIn, data[0], data[1], data[2], data[3]);