diff --git a/llvm/lib/Object/MachOObjectFile.cpp b/llvm/lib/Object/MachOObjectFile.cpp
index c6ce5b0..9289983 100644
--- a/llvm/lib/Object/MachOObjectFile.cpp
+++ b/llvm/lib/Object/MachOObjectFile.cpp
@@ -2477,6 +2477,8 @@
   case MachO::CPU_TYPE_ARM64:
     switch (CPUSubType & ~MachO::CPU_SUBTYPE_MASK) {
     case MachO::CPU_SUBTYPE_ARM64_ALL:
+      if (McpuDefault)
+        *McpuDefault = "cyclone";
       if (ArchFlag)
         *ArchFlag = "arm64";
       return Triple("arm64-apple-darwin");