diff --git a/src/Reactor/SubzeroReactor.cpp b/src/Reactor/SubzeroReactor.cpp
index 9cd6fb8..5468cb9 100644
--- a/src/Reactor/SubzeroReactor.cpp
+++ b/src/Reactor/SubzeroReactor.cpp
@@ -40,8 +40,8 @@
 #include <Windows.h>
 #else
 #include <sys/mman.h>
-#if !defined(MAP_ANONYMOUS)
-#define MAP_ANONYMOUS MAP_ANON
+#if !defined(MAP_ANONYMOUS)
+#define MAP_ANONYMOUS MAP_ANON
 #endif
 #endif
 
@@ -2572,6 +2572,11 @@
 		return RValue<Short4>(Nucleus::createShuffleVector(x.value, x.value, shuffle));
 	}
 
+	RValue<Short4> Unpack(RValue<Byte4> x, RValue<Byte4> y)
+	{
+		return UnpackLow(As<Byte8>(x), As<Byte8>(y));
+	}
+
 	RValue<Short4> UnpackLow(RValue<Byte8> x, RValue<Byte8> y)
 	{
 		int shuffle[16] = {0, 16, 1, 17, 2, 18, 3, 19, 4, 20, 5, 21, 6, 22, 7, 23};   // Real type is v16i8