diff --git a/libunwind/src/DwarfInstructions.hpp b/libunwind/src/DwarfInstructions.hpp
--- a/libunwind/src/DwarfInstructions.hpp
+++ b/libunwind/src/DwarfInstructions.hpp
@@ -202,7 +202,10 @@
       pint_t cfa = getCFA(addressSpace, prolog, registers);
 
       (void)stage2;
-#if defined(_LIBUNWIND_TARGET_AARCH64)
+    // __unw_step_stage2 is not used for cross unwinding, so we use __aarch64__
+    // rather than LIBUNWIND_TARGET_AARCH64 to make sure we are building for
+    // AArch64 natively.
+#if defined(__aarch64__)
       if (stage2 && cieInfo.mteTaggedFrame) {
         pint_t sp = registers.getSP();
         pint_t p = sp;