diff --git a/lib/Support/Triple.cpp b/lib/Support/Triple.cpp
index 2c2c90a99eb..2b8b39782cc 100644
--- a/lib/Support/Triple.cpp
+++ b/lib/Support/Triple.cpp
@@ -61,6 +61,8 @@ const char *Triple::getArchTypePrefix(ArchType Kind) {
   default:
     return nullptr;
 
+  case arm64:
+  case arm64_be:
   case aarch64:
   case aarch64_be:  return "aarch64";
 
@@ -69,9 +71,6 @@ const char *Triple::getArchTypePrefix(ArchType Kind) {
   case thumb:
   case thumbeb:     return "arm";
 
-  case arm64:       
-  case arm64_be:    return "arm64";
-
   case ppc64:
   case ppc64le:
   case ppc:         return "ppc";