diff --git a/src/posh.h b/src/posh.h
index 18b6795..a9afccf 100644
--- a/src/posh.h
+++ b/src/posh.h
@@ -572,6 +572,18 @@
 #  endif
 #endif
 
+/* ------------------------------------------------------------------
+** AArch64
+** ------------------------------------------------------------------
+*/
+#if defined __aarch64__ || defined __arm64__ || defined FORCE_DOXYGEN
+#  define POSH_CPU_AARCH64 /**<if defined, target CPU is AArch64 */
+#  if !defined FORCE_DOXYGEN
+#     define POSH_CPU_STRING "AArch64"
+#  endif
+#endif
+
+
 /** @} */
 
 #if !defined POSH_CPU_STRING