diff --git a/Source/Core/Common/Src/MathUtil.h b/Source/Core/Common/Src/MathUtil.h
index ec9c9cc8a3..b4c73e6457 100644
--- a/Source/Core/Common/Src/MathUtil.h
+++ b/Source/Core/Common/Src/MathUtil.h
@@ -158,7 +158,7 @@ inline u64 Log2(u64 val)
 #if defined(__GNUC__)
 	return 63 - __builtin_clzll(val);
 	
-#elif defined(_MSC_VER)
+#elif defined(_MSC_VER) && defined(_M_X64)
 	unsigned long result = -1;
 	_BitScanReverse64(&result, val);
 	return result;