diff --git a/src/perf-jit.h b/src/perf-jit.h
index 25cc3b3..6efa4bb 100644
--- a/src/perf-jit.h
+++ b/src/perf-jit.h
@@ -66,11 +66,13 @@
   void LogWriteBytes(const char* bytes, int size);
   void LogWriteHeader();
   void LogWriteDebugInfo(Code* code, SharedFunctionInfo* shared);
+  void LogWriteUnwindingInfo(Code* code);
 
   static const uint32_t kElfMachIA32 = 3;
   static const uint32_t kElfMachX64 = 62;
   static const uint32_t kElfMachARM = 40;
   static const uint32_t kElfMachMIPS = 10;
+  static const uint32_t kElfMachARM64 = 183;
 
   uint32_t GetElfMach() {
 #if V8_TARGET_ARCH_IA32
@@ -81,6 +83,8 @@
     return kElfMachARM;
 #elif V8_TARGET_ARCH_MIPS
     return kElfMachMIPS;
+#elif V8_TARGET_ARCH_ARM64
+    return kElfMachARM64;
 #else
     UNIMPLEMENTED();
     return 0;