diff --git a/vmac.cpp b/vmac.cpp
index 8312854b..d9e3b321 100644
--- a/vmac.cpp
+++ b/vmac.cpp
@@ -435,7 +435,7 @@ VMAC_Base::VHASH_Update_SSE2(const word64 *data, size_t blocksRemainingInWord64,
 	#define AccumulateNH(a, b, c) a += word128(b)*(c)
 	#define Multiply128(r, i1, i2) r = word128(word64(i1)) * word64(i2)
 #else
-	#if _MSC_VER >= 1400 && !defined(__INTEL_COMPILER) && !defined(_M_ARM)
+	#if _MSC_VER >= 1400 && !defined(__INTEL_COMPILER) && !(defined(_M_ARM) || defined(_M_ARM64))
 		#define MUL32(a, b) __emulu(word32(a), word32(b))
 	#else
 		#define MUL32(a, b) ((word64)((word32)(a)) * (word32)(b))