diff --git a/include/acpi/platform/aclinux.h b/include/acpi/platform/aclinux.h
index 68534ef86ec81a903e09ccd93169baf69b4bb73e..fda0f3e35c03fc40043cbfdba951cbe1852d9ca6 100644
--- a/include/acpi/platform/aclinux.h
+++ b/include/acpi/platform/aclinux.h
@@ -87,7 +87,7 @@
 #define ACPI_FLUSH_CPU_CACHE()
 #define ACPI_CAST_PTHREAD_T(pthread) ((acpi_thread_id) (pthread))
 
-#if defined(__ia64__) || defined(__x86_64__)
+#if defined(__ia64__) || defined(__x86_64__) || defined(__aarch64__)
 #define ACPI_MACHINE_WIDTH          64
 #define COMPILER_DEPENDENT_INT64    long
 #define COMPILER_DEPENDENT_UINT64   unsigned long