--- Source/JavaScriptCore/heap/MachineStackMarker.cpp
+++ Source/JavaScriptCore/heap/MachineStackMarker.cpp
@@ -301,7 +301,7 @@
 typedef ppc_thread_state_t PlatformThreadRegisters;
 #elif CPU(PPC64)
 typedef ppc_thread_state64_t PlatformThreadRegisters;
-#elif CPU(ARM)
+#elif CPU(ARM) || CPU(ARM64)
 typedef arm_thread_state_t PlatformThreadRegisters;
 #else
 #error Unknown Architecture
@@ -333,7 +333,7 @@
 #elif CPU(PPC64)
     unsigned user_count = PPC_THREAD_STATE64_COUNT;
     thread_state_flavor_t flavor = PPC_THREAD_STATE64;
-#elif CPU(ARM)
+#elif CPU(ARM) || CPU(ARM64)
     unsigned user_count = ARM_THREAD_STATE_COUNT;
     thread_state_flavor_t flavor = ARM_THREAD_STATE;
 #else
@@ -396,7 +396,7 @@
     return reinterpret_cast<void*>(regs.__rsp);
 #elif CPU(PPC) || CPU(PPC64)
     return reinterpret_cast<void*>(regs.__r1);
-#elif CPU(ARM)
+#elif CPU(ARM) || CPU(ARM64)
     return reinterpret_cast<void*>(regs.__sp);
 #else
 #error Unknown Architecture
@@ -410,6 +410,8 @@
     return reinterpret_cast<void*>(regs.rsp);
 #elif CPU(PPC) || CPU(PPC64)
     return reinterpret_cast<void*>(regs.r1);
+#elif CPU(ARM) || CPU(ARM64)
+    return reinterpret_cast<void*>(regs.__sp);
 #else
 #error Unknown Architecture
 #endif