--- src/cmd/dist/util.go	2016-01-15 11:27:49.092713185 -0600
+++ src/cmd/dist/util.go	2016-01-15 11:29:50.616721387 -0600
@@ -404,9 +404,7 @@
 	switch gohostos {
 	case "darwin":
 		// Even on 64-bit platform, darwin uname -m prints i386.
-		if strings.Contains(run("", CheckExit, "sysctl", "machdep.cpu.extfeatures"), "EM64T") {
-			gohostarch = "amd64"
-		}
+		gohostarch = "amd64"
 	case "solaris":
 		// Even on 64-bit platform, solaris uname -m prints i86pc.
 		out := run("", CheckExit, "isainfo", "-n")